They're one of the downloads under the Campaign Cartographer 3 plus heading. ("Monthly Content")

14 new maps in the atlas from Jim. Thanks for the contribution:

Or just type the coordinates on the command line. Place the first corner normally with the mouse, then enter @70,15 on the command line for the second corner.

See this FAQ entry:

My drawing tools are missing their textures (or show incorrect textures)

Unfortunately, it is very difficult to stop single spammers posting a single post. As long as a physical human being is willing to spend the time and register manually on the forum, it is impossible to stop them without also be very hostile to legitimate newbies.

The forum is utilizing public spam lists to avoid those people jumping from forum to forum to register and spam, and it also have rate limits to prevent a spammer from doing things like filling the front page with spam (using manual or automated means), as well as edit limits to prevent the classic "post a generic but not spam post, and then go back and edit it after moderators have read the original post and moved on" but the single individual posts will continue to appear, and we remove them as soon as we notice. As already mention, use the Flag link in the post to report it.