You can look at the source code of the URL. If the URL on the blog or site shows
<a href="example.com" rel="nofollow"> then it's no follow, if it's just a normal
<a href='example.com'> then it's do follow. For example on this forum, all links are
nofollow unless you are granted moderation privilidges, or you reach some of the higher levels of users, then your account becomes do follow.
In order to support the cost of hosting the forum, might make it so you can upgrade to get do follow links and access to the lounge