Topic Assignment

I’m looking for a way to assign topics to individual writers, but have the system automated so that users can choose their own topics from a list.
Say I create a Members-Only page with an aggregated list of posts I create that have the topic and details of the assignment already included. The posts in this list would only show posts created by admin. I want to put a linked button next to each post in the list that allows each writer to change the author to himself/herself. Because the list only shows posts by admin, the post would be removed from the list.

Which function could I use in the link to specify this?

Alternatively, if you know of any plugin that does something like this, let me know.

Thanks in advance,
Brandon