Ok, my problem is that when I click on the head texture in the Torishop to buy it, it sends me to a wiki page.

Any ideas how to fix this or what I'm doing wrong?

May i ask how many Tori-Credits you have? The head texture costs 20,000 Tori-Credits.

You need to click on the buy button, which is to the right of the link you are clicking on.

If there is no buy button, you don't have enough tori-credits and it should say "You need 20,000 Tori-credits" or something similar to that.