Go to QT wallet, then go to debug console.
You can vote on each project individually. Up to 168k sys will be distributed to proposals in order of AbsoluteYesCount.
AbsoluteYesCount needs to be atleast10% of total MN around to let the proposal go through.
List proposals with: gobject list
Then make your choice for a yes or a no and copy paste the hex of the proposal in [hex]
In case of a yes:
gobject vote-many [hex] funding yes
In case of a no:
gobject vote-many [hex] funding no
Press enter when you put it in the console and it will immediately show you whether the voting succeeded.
Votes can be changed from yes to no and the other way around any time until closure of the proposals.