Esam,
in your HREF attribute, try adding a https:// before the URL.
Change this:
<a href="www.njskateshop.com" target="_blank">www.njskateshop.com</a>
to
<a href="https://www.njskateshop.com" target="_blank">www.njskateshop.com</a>
Note the new href attribute and the https:// preceding the external site URL.
You must indicate a https:// to dictate that the URL is on an external site, and not residing on your current site. Without the https:// your site thinks those are pages that live on your site and treat it as such.
That will work. I just tested it out on your site.
If you want to link to internal pages ( pages or posts that reside on your current site ) you can do so by just adding the base url of the page or post you are trying to get too. For example href="/new-post/"
will direct the user to the post or page title with the URL yoursite.com/new-post/.
Hope that helps and explains a bit about external vs internal linking.
Evan