You may use your signature block to advertise your blog as long as you are participating in the forum.
Blatant advertising is frowned on and may be deleted by moderators without warning.
If you have a specific post (either your own or another's) that is relevant to a discussion, you may post a link and talk about the relevance.
I'm sure you can understand that if thousands of forum users posted threads entitled "Read my blog", this board would turn into a free classified advertising site. Not as much fun to wade through for those who come here to discuss particular issues with others.