Go to the last one, not the most recent.
http://www.minecraftworldmap.com/worlds/aDubsUp on the top right, there's a button that says "markers". Click that, and click "signs".
There are a few other options for maps too:
Change corner north is facing
Display signs
Display chests/furnaces
Display mob spawners
Change texture pack
I left north for consistency, but if anyone ever wanted a different areal angle for something, it's doable.
Signs get so cluttered, I'm not sure how useful it is, so I wouldn't bother running it a second time unless someone really liked it.
I think displaying chests is a bad idea. Just in case anyone is stashing anything away that they don't want other people to get at.
Mob spawners give away dungeons, and I think it's more fun to stumble across them.
I don't have any need for using a texture pack, but like the angle one, if anyone wants a special render, I've already paid for the service, let's use it.