I dont remember how i did mine... www.anorexiadating.com i have a banner there, but without that nothing is there.
I either edited the dashboard or the main and i chose customize this page and i removed those items by clicking on the x. now they dont show on the join but they do show once the member is logged in..
try that.
Maybe try to use the advertisement plugin and in the banner code either put a blank image with transparent background or use an image that is same color as background.
lol sorry i was not clear, no you dont turn off sidebar, you do a visual trick. If you saw my ad banner where the side bar should be. What you do is you just use a transparent image instead of the red banner that i used.
It will have the same affect, the side bar will go away because you are displaying a banner, and if you use transparent image (or an image the same color as the background) for the banner, it looks like nothing is there. Its just a visual trick.
Here is my dashboard, do you see anything missing?, i dont. On the dashboard the banner just shows under the sidebar data.
here is the image..
The only thing you will have left to do is just take out the word advertisement from your lang file and make it say something else like welcome or hello or something, you dont want to leave it blank because then you cant find it.