Since the last version of the Lisk Nano client, available here Lisk.io, it's easier to vote for ! Here are a few steps in order to vote.
You must first create a Lisk wallet with the Lisk Nano client or the Lisk web wallet. Keep your private key secret !
From the Lisk Nano client, you can now vote in the "vote" tab. Select up to 33 delegates per vote. Do not forget the winning trio.
Create your wallet
Go to the Voting tab
Choose RobinHood, LiberSpirita et Liskpro.com
Click on "Vote" and voilà !