Stupid little question:
I tried the whole thing with the bootstrap but in some way it didn't worked for me (after starting the client, it was just stuck at 64 for ever).
But I had the client installed before (though it was not synchronized) and made a back up of my wallet.
I already had send some XST to my wallet (wasn't synchronized so I couldn't see them though).
I'm synchronizing the client again right now but how do I open the old wallet (I encrypted the wallet already back then)?
Do I have to insert the back up somewhere?
Thanks guys

After your wallet has synced, close your wallet and copy your old wallet.dat to your personal Stealthcoin folder and restart your wallet.
Now you have to enter your old passphrase and voila, your old wallet is useable.
More questions? Join Stealthcoin.slack.com.
I am @sushi2k7