Of course you can. There is nothing preventing you from creating an official announcement for your blog in the gambling section. I don't know how it came to your mind that this might be prohibited in a board dedicated exclusively to gambling activities.

According to my knowledge of the forum rules, it is not permissible to publish referral links in the main topic or in any of the posts, whether they belong to the site owner or any of the publishers on the topic. However, it is allowed to add referral links to the signature space.
The best thing you can do is to put the referral link in a signature design and mention this in your post for those who want to access the site to use the link in the signature.