Read this page:
http://wordpress.stackexchange.com/help/privileges/new-user
It says here:
Note that one needs to earn 10 rep on the site to be able to answer a protected question. The association bonus does not count.
You need to earn 10 rep on the site, and not get it through bonuses. Th...
@NiKoLaPrO try playing with things. You'll come to know that you can change those colors without actually changing them(I mean you can change something else(like a theme) and there colors will automatically change)
@smkplus just in case you wonder, MSE got its own chat domain, so even though you have more than 20 rep on other sites, you need 20 on MSE itself to take part in chats here.