Well, here is the ol' d&d blog

You can make a post about a current campaign, character development, world development, new d&d materials, new concepts, etc. Then, while you are on the edit post page (the same page you make new posts on) look at the bottom right box; that is where you can put labels. So every time I put up specific information for my dragonborn priest in david's campaign, i can put the label "Finn" or "David's campaign" or "character backstory" or "character development" or whatever. Then, you can quickly reference everything with a given label (David's campaign, for instance) and see all the posts relevant to that label. This blog can be a nice tool for keeping up with campaign information and whatnot.

you can insert hyperlinks by using the little icon of the world with the chain link on it (between the italics and quotation icons), and insert pictures or videos by those other icons.

That's pretty much it.