Robb... you should have rights to edit your own posts... in the right hand lower corner of the post
WIP Bailiwan - Cartographers' Guild_1222822977534.png
is where you will find the edit button.
As for deleting, I'm not sure if you can delete your own post or not, however if you edit and put *delete post* ... someone will come along and delete it at some point...
If you can delete them, usually the method is that you edit post, then hit GO advanced.... at the top will be the delete menu.