I want to add ads on my forum how would I do that with out losing it after an update of the theme. My theme is currently translated as well to Spanish.
As always we recommend that you create your own SP theme so that any customisation is not lost during a future update. See – http://codex.simple-press.com/codex/themes/theme-basics/creating-a-theme/
more here: http://codex.simple-press.com/codex/faq/problem-with-post-edit-buttonow-to/faq-how-to-display-ads-in-the-forum/
One thing how do change this code if($spTopicView->currentPost==1) to be able to have the ads apear on the first post of each page and then the code for last post of each page.
I tired this but no luck if($spTopicView->currentPost==first)
have you seen forum – toolbox – data inspector? you can dump a lot of useful information for these kind of things to the screen for various options…
you can tell the last post on the page by $spThisTopic->last_post_on_page… when true, you are there…
for the first, use $spThisTopic->first_post_on_page
I tired this and it didnt work? Am I doing something wrong?
if($spThisTopic->first_post_on_page==true)
didnt try the data insepctor, did we? 
would have been obvious that I goofed and gave you the wrong variables.. 
sorry…
you want $spThisPost->first_post_on_page and $spThisPost->last_post_on_page
great this should work now 