Here is the link to the Hubpages FAQ's which will provide you all the information you need: (I actually found some useful info there that I didn't know!)
Here are the main points about links.
Hubpages does not allow:
-including more than 2 links to any one domain
-linking to the same domain in the body of the text AND in an RSS feed
-short "teasers" with links to "read more" at another site
-linking to sites/pages/Hubs that are unrelated to your Hub's topic
-including links to a page that contains largely the same content as your Hub
So, a link or two in your hubs that lead to your blog are perfectly fine!