Well, the problem's in the title.
I filled in the form at insimadult.org and clicked agree and this is what the site tells me:

"Sorry, you are not allowed to register on this forum.Site banned for spamming"

I have never ever been to the forum, maybe my IP is too close to a banned one or something?
Can someone help me, please?

Hey guys -there is a way to recolor walls and floors in simPE
If advaced mode is on in your simPE, you will find the walls and floors under "other" in the object workshop. CLone a maxis wall/floor (i don't knoe if it works for custom ones) and change the txtr files as you wish (like recoloring an object). The price can be set in XOBJ.

Look here for a tut on this.