just put them in your wallet and leave it on or you can put them in poswallet.com and they stake automatically and there you get dividends too.
Actually, it's worth mentioning that this "dividend" payout is rather low.
I decided to do a POSW staking test a few months ago. With 600 POSW staking, I get 1-2 POSW monthly. Not exactly trying to get rich here, lol
For now, I'm waiting to see what happens with this project.