Yes, if you bought the design with full rights then you can do what you want with it. However the link above is not supposed to be a portfolio of sites you run, it is supposed to be a portfolio of designs you have created.

Putting a design which you bought in your design portfolio is something which a self-respecting designer should never do. You didn't come up with the concept or put the hard work into the design so including it in your portfolio is misleading potential clients into thinking that you have a level of skill which the real designer has and you do not. As a designer yourself you should know how much is sucks when someone else tries to rip or claim your work.

Now how can I be sure that you created any of the designs in your "portfolio" and your services are even worth the $40?