Here's an example, I went to the comment box for the post and clicked the little heads with a +
Then I get to add on my main account and flag-queen,
Make sure you add the username and a green check mark appears, then use the +/- to select how much of the reward you want to delegate..
Be sure to then press the Green Plus sign to 'add' the account,
SAVE And you're done.. now for the comment I would have made on this post (but didn't actually publish it), 5% of the comment's reward would go to my main account with 95% going towards @flag-queen, yay!