This should help... Let me know if you have any issues
walletpassphrase "YourPassphraseHere" 9999999
Can't understand? wallet adress password 9999999?
go to Help>debug window
type on the CLI: walletpassphrase(space)[yourpassword](space)[some large number](space)true
where the large number equals the number of seconds the wallet will remain unlocked, and the last word indicates that the wallet is being unlocked for staking only
should look like this:
walletpassphrase yourpasswoRd 7777777 true
to completely unlock for 7.77 million seconds:
walletpassphrase yourpasswoRd 7777777 false