I think he wanted to say that it is according to the forum rules, that you cant promote your website or links here, on this forum. Advertising can lead to ban. But if you participate in discussion and help members then you can add link to your posts.
Advertising is a form of communication to convince an audience (viewers, readers or listeners) to take certain actions with respect to products, ideas or services. In most cases, the desired outcome for driving consumer behavior in relation to a commercial offer, despite the ideological and political advertising is also common.