-go to my.dot.tk
-on top of the page in the menu click my DotTK
-login with your e-mail adress
-go to my marketing in the menu on the left.
-select the domain for which you would like to remove a banner.
-Here you have the choice between no banner, fame banner and pop-up banner. Obviously you'll have to select no banner.
-when you click continue it will say DotTK Linker Promo is disabled. It's possible you'll have to wait some time untill you can see the difference.