Congrads on getting to 30+. But don't rush to fill out the form, tho it's good to go through it to make sure you understand what's there.
On the right side of the "form" page is a count of the number of posts you've made this month. Right below that is a link that will let you see all of the posts that you have made. The form is asking you to select 3 of your many posts (ones that you like the best or that represent good posts). On each post - at the top -- there is an ID # for the post. When you've identified the posts you want to select, jot down the ID#'s of the 3 you like best. (I usually look through the posts and find more than 3 as I work my way back to the first of the month, but ultimately select 3 that I like the best.)
Some people might do a copy/paste of the ID#'s; your choice. I write them down on a piece of paper. Just make sure the number is put in correctly.
I ususally wait until the 27th of the month before I request the bonus and I usually have more than 45 posts. Doing it later in the month gives you a larger number of posts to select from PLUS it gives you some cushion just in case some of the posts do not come up to muster. Any post made to the Contests and Promotions section of the Forum, for example, does not count towards the eligible 30+.
After you've entered your 3 ID numbers, click the submit link.
The Forum bonus is credited toward the end of the month following the month you made the request. (ie a Sept 27th submit will be credited, if approved, on October 30th.)
At the bottom of the form submit page, is a history of the Forum posting requests you've made and their status. After you click your submission for the first bonus, check the history. It should say that is will be payable in X number of days.
If you have any more questions, just come back here and ask.
Hope this helps.