I have a question about staking, I've read the FAQ but it is still unclear for me. Let say my balance is exactly 20 ORB, but received with different addresses, am I staking, or should I send myself those 20 ORB to stake ?
Click on "Send" button. You should see a "Coin control" button on the right. Click it. That will open a new window in which you'll be able to see the "inputs" for each (ORB) address in your wallet.
Depending on the content of the "orbitcoin.conf" those inputs might be or not eligible to stake.
You should have at least something like that in that file:
stakemindepth=5000
stakecombine=30
stakesplit=60
port=15298
rpcport=15299
rpcuser=orbitcoinrpc
rpcpassword=
addnode=seed0.orbitcoin.org:15298
addnode=seed1.orbitcoin.org:15298
Anyway, 20 ORB is a quite small amount to stake. Get some more, say up to 1000 ORB, then split them in 31 inputs of 31 ORB each and an imput of 39 ORB, and let them just sit in your wallet for a few months. You'll see that the 39 ORB chunk will have slightly more chances to be elected for stake than its 31 ORB siblings, but on a much larger time interval, each ORB will be "equal" to the others
L.E.:
On Windows (Vista and newer), orbitcoin.conf will be found in %userprofile%\AppData\Local\orbitcoin (i.e. c:\users\Lisa_nelson\AppData\Local\orbitcoin).
On Linux, you'll find it in /home/Lisa_Nelson/.orbitcoin/ (mind the dot, it's important).
Whatever you do, make sure you keep a (recent) backup of your wallet.dat file! Oh, and keep it safe (like the PIN on your creditcard)