Pardon me if you've already tried the following, but here's how I get mcforum to bring me to page(s) indexing all my posts chronologically...
1) First, toward the top of any page on mcforum.net you should see a horizontal bar of options:
Home Help Search Profile My Messages Calendar Members Logout
Click on "profile".
2) Then on the resulting profile page, in the left column you should see
<username>
member
Show Posts
Show Stats
Click on "Show Posts"
3) There is no (3) beyond the obvious scroll through the resulting page(s).
Hope that helps.