Is there a FAQ or Guide which is as detailed as the description in the email for the whole process (with opening the margin position)? The Trading Guide seems to be not very detailed.
Yeah, the trading guide needs a revision to add more details and examples. Let me offer a quick crash course here that will hopefully answer most of the questions you have.
When placing margin orders everything in the order form works the same as it does for spot trades, because a leveraged margin position is just a spot trade executed through an advance financed by Kraken. For example, a long XBT/EUR position is opened by advancing the trader EUR to buy XBT in a spot trade. And a short XBT/EUR position is opened by advancing the trader XBT to sell for EUR in a spot trade.
So to create a margin order, you enter everything in the order form just as you would for a regular spot trade (the "Amount" field still determines the size of the order, the price parameters for the various order types work the same, etc.) - EXCEPT you select a level of leverage for the order. Selecting a level of leverage means that the order, if executed, will execute a spot trade through an advance financed by Kraken (rather than a spot trade executed directly from the balances in your account).
What about the different levels of leverage? The different levels of leverage just determine how much of your account balance is "tied" to the position as a kind of "collateral" for the advance used to open the position. For example, if you have 10 BTC in your account and open a 5 BTC long @5:1 leverage, then 1 BTC is tied to the position. Since only 1 BTC is tied to the position, you could withdraw up to 9 BTC, but not more, because that last 1 BTC is tied to the position. Similarly, the 9 BTC is available in your account as buying power for opening more positions or making other trades. With 5:1 leverage, you could open positions up to 50 BTC in total volume (but keep in mind that having positions that are much larger than the balance of your account puts you at greater risk of margin call/liquidation, so be very careful about doing this).
Alternatively, if you select 2:1 leverage instead of 5:1 leverage, then 2.5 BTC would be tied to the 5 BTC position. In this case you would only be able to withdraw up to 7.5 BTC and would only have 7.5 BTC buying power left for other trades.
The risk of your margin position to amplified losses or margin call/liquidation is really determined by the size of the position relative to your account balance (and not merely by the level of leverage you select). If you have a 10 BTC balance and open a 5 BTC position, the choice of 5:1 leverage over 2:1 leverage does not really make the position more risky. I think for most traders it's better to just choose the higher level of leverage leaving more buying power in the account, so long as the trader is mindful of not getting to the point where they have positions that are 5x the size of the account balance (but of course for some traders with very high risk tolerance, getting to this 5x level might be OK for their trading style).
Another key point to keep in mind is that not all currencies are "margin currencies" - i.e. currencies that can be "collateralized" for the advance. Currently the only margin currencies on Kraken are BTC, EUR, and USD. So, for example, if you only have ripples (XRP) in your account, you will not be able to margin trade at all.
Hope this helps!
Another topic:
If you are at https://www.kraken.com/u/trade (or charts) and scroll down to the bottom. Hover the mouse over the "Trading Guide" link. You will see, that it will redirect you to https://www.kraken.com/redirect?url= . I already wrote this to support some months ago, but it seems they don't care.
If you are at https://www.kraken.com/help/faq , the link to the Trading Guide is correct.
Thanks - it's not that we don't care, just have too many other projects/distractions and this has been neglected. I'll see if we can get it fixed soon though.
Really important information, nice course, thanks.