Depends on what kind of forum you are using. There are many SEO tools available for each forums like Phpbb and vBulletin if you just google it.
use vb seo and try get huge backlinks becuse backlinks only can improve your ranking fast and other all work vb seo will do perfect
I'd start by using basic SEO best practices. Optimise the URL first (thers lots of SEO scripts for PHPBB and VBulletin out there) Optimise the title and description tag in line with the content on the page With regards to the action page, you can optimise the heading of the post by using H1, H2 tags so the search engines know the theme of the post. Use plenty of viral marketing as mentioend above e.g. signatures in your posts on other forums and emails. Also, when you start topics, make sure they are topics that people are actually searching for. You can do this by using Google's keyword tool to give you some ideas. It won't be rankiedn immediately but over time once it gets indexed you'll get sustainable traffic. Good luck.
is this forum www.webmaster-money.org optimized? Looks like not since I have many posts and forum is up there long time but SE traffic is very low.