Help > Debug > Console > Enter:
Code:
walletpassphrase 9999999
This will unlock your wallet for 9999999 seconds (>100 days) or until you restart the client.
i try this and i get this response :
16:11:04

Error: Error parsing JSON:new
Did you replace secretkey without the brackets with your password?
walletpassphrase xxx 9999999
tried that too ... my passphare is long and has spaces does that matter ?
my PW ended with a # .... i changed it to just letters... then retried and the response line to the command is just empty

is that what it does ?
Place your mouse cursor over the lock in the lower right once you issue the command properly, it should say "Wallet is encrypted and currently unlocked"
Then you just wait. PoS will randomly stake your blocks (7 or more days after maturity), after an additional number of days your blocks will pay out. The longer it takes the more it pays out.
It does not only apply to blocks. Any transaction is eligible for stake