Question about SEO of WPMU Questions and Appearance

Dear Sir/Madam

We prepare a question and answers site with WPMU platform. We have the following question

- it seems that Q&A doesnt fit well in default theme of wordpress
You can check on http://ask.secnews.gr/questions/ask
What can we do to place it the right way and be well placed
- What is the best SEO settings on Wordpress SEO taxonomies,metabox and tags that can make it work fine. We know how exactly to setup that for a default site but we do not know what is the best way to deal with Q&A and wordpress seo so not to create problem in indexing.

If you need passwords/api keys please inform us where to send the specific information.