Summarize the following:
Scroll down a little until you find the "Your Most Liked Posts" section. By default, 4 posts are already selected.  Unselect them by clicking on the green button at the bottom right of every post. You can select a new one by clicking on the posts that are not visible or are in grey color. Remember, you have to select 4 out of 4 posts.

Summary:
Go to “Your Most Liked Posts” section. Select the right Posts.