As you are a member since some time and may fall under the agreement to have the right to remove the “Designed by Joomlart.com” with your earlier club membership, you can simply remove that copyright in the templates index.php or footer.php files.
This is the outside appearing copyright notice, the one you did remove is some inside one.
You have to open your index.php in the templates folder and may see the copyright in the lower section. In some cases it is also contained in the footer.php or some other file.
Like I said, from my knowledge you are allowed to remove the copyright, when I am wrong then correct me with this one, as I joined shortly before the change of the terms and so was allowed to remove this footer or change it to my needs.
Hope this helps!