On these forums, the title beneath your user name changes as you make more posts. The following table shows the titles you get for the numbers of posts you have. Please remember that there are rules covering spam, so don't try to raise your post count artificially.

Code:

  Posts | Title
--------+---------------
   0-29 | Junior Member 
  30-99 | Member
   100+ | Senior Member / Custom title
The custom title can be edited via the User Control Panel in the Custom User Text section.