Is it safe there?
Can I withdraw it from there everytime in future?
Should I use OMni wallet to do so?
THX
It is safe there as long as you control that BTC address and Priv key.
You can withdraw at anytime in the future but if you choose to keep it there then you are going to need to pay attention to when the Safecoin conversion occurs. No one knows how this will occur but it will likely involve sending Maidsafe coin to a specified address and then withdrawing Safecoin. Don't want to miss that.
Omniwallet is currently the only option. I have used it with success. Just follow all of the necessary steps. That said, keeping it with your BTC address until the transfer isn't a bad idea unless you want to send to an exchange.
thx for your helpful answer.
This is a BTC adress in my Blockchain wallet. How do I get there the priv key?
http://bitcoin.stackexchange.com/questions/7536/how-do-i-export-my-private-keys-from-my-bitcoin-qt-client
Do each step carefully and with caution. You don't want anyone to get your priv key.