First I setup tables to install phpbb..

then i uploaded phpbb seo, then its
telling me tables already exist for the first one...

so i need to delete the forum tables, and
start over again... ? why cant phpbb seo just
add to the existing tables... ive already
started my forum categories....

because the phpseo is wanting me to do just that
unless i am misunderstanding something here.

Thanks for your help.

This should help : phpBB3 => phpBB SEO premod.