[we_are_borg]

The RSS button is done trough the admincp Settings>Options>External Data Provider. When you are there disable Enable RSS Syndication this will remove the RSS button next to subscribe to this forum.

Update:

Found them in the template you need to edit the template to get it out of sight because i cant find an on or of switch for it.

You need to edit to templates namely
* forumhome_forumbit_level1_post
* forumhome_forumbit_level2_post

Do a search and look for "forumactionlink subslink" you will find it in does two templates now you need to remove the following.

forumhome_forumbit_level1_post remove:

<li class="forumactionlink subslink"> <a href="subscription.php?{vb:raw session.sessionurl}do=addsubscription&amp;f={vb:raw forum.forumid}" title="{vb:rawphrase subscribe_to_this_forum}">{vb:rawphrase subscribe_to_this_forum}</a></li>

forumhome_forumbit_level2_post remove:

<li class="forumactionlink subslink"> <a href="subscription.php?{vb:raw session.sessionurl}do=addsubscription&amp;f={vb:raw forum.forumid}" title="{vb:rawphrase subscribe_to_this_forum}">{vb:rawphrase subscribe_to_this_forum}</a></li>

There is one warning do not use the back button when i did that the template was reverted to the standard one do two searches if you need to.