The cover in Promotions does lack text on the cover, and yet the cover on the Storefront page does. But it's also obvious which are links because when you 'mouseover' what is a link the pointer turns in to a hand, and normally shows the address too before you click it.
I do find the cover to be a bit strange though. The bright green (and very plain) bands seem to be a rushed afterthought, you can see where it overlaps the photos.
What you see is what you get; you will have to choose
another design without white boxes, if there is one. Alternatively use a
photograph - of the right dimension - as your front and back covers; just add
your text to the front cover. You can use a program such as paint.net to do
this, and then deselect the Lulu cover wizard text generator, or use the Lulu
cover wizard text generator if you prefer.
First of all. The One Piece Cover Wizard is nothing to do with ebooks.