When I try to edit and add/remove items, I can't find any check box anywhere, nor the options to add items.
Note: I didn't enter to my wishlist through my profile, I went to personal and then wishlist, and I have the same issue.
The page looks like this, no matter which option I click
[URL=http://s85.photobucket.com/user/FDDfiredark/media/wishlist_zpsf97e1858.png.html][IMG]http://i85.photobucket.com/albums/k45/FDDfiredark/wishlist_zpsf97e1858.png[/IMG][/URL]
[img align=center]http://i85.photobucket.com/albums/k45/FDDfiredark/wolfrun.gif[/img]
Did you click on the category of your wishlist? In your screencap it would be the "No Category" text under the picture of the skeleton dog.
Once your in the category, there should be a box where you can type in the name of items you want to add. Under each item there should be a box that says "delete". Check that and at the bottom of the page click "organize wishlist items".
Alternatively, you can add items to your WL by clicking the (+) that appears when you hover over the item. You can delete WL items from your inventory, provided you have them, by clicking the item and then the "remove from wishlist" option.
Have you tried going to "Home" on the WL page. This is the link you should be using to get there. Also, the page is going to look like that no matter which option you use until you choose a category.