A couple minor adjustments need to be made to the paragraph on your homepage that links to the signup page. Professional writing is essential to gain your clients' trust. Make the paragraph flow a little more, maybe not make the whole block a link. Maybe add a "Sign Up Now!" link under the paragraph. Change "Why Create A Forum?And Choose Us" to just "Why Create a Forum?". Add a space after the comma near the end of the paragraph (change "...with other users,zisted" to "...with other users, zisted". But all in all, your service looks great. Just need a few touch ups to make it look more professional.
Already mentioned this for another site, but it applies to your site as well. Your icons don't match your content. What does "@" symbol have to do with support? Probably would be better off moving your "?" from "Terms of Service" to there. Also, the "Create a Free Forum" button looks really bad.