OK, if you have total access, that's great.
Do you have a FTP program ?? There was a recent thread here about that if you need one. There are several free or cheap programs out there.
When you have that ready, access your site and save a copy of the index or home page (whatever it's called) to your hard drive. You could just do that with your browser too.
That is what you will use to edit that little line in that
PSU gave us. Start in whatever HTML program you use and do a "save as" to another file name. (old index) Then close that and re-open the file with the original name. Edit in the line in the area near the top of the page. Save. FTP it back to the site.
The file you FTP up should be the same name as the file you downloaded and it will over-write the file that is there on the site.
Check out the page in your browser. If for some reason it doesn't work right, you have the original file on your HD. Just change the name on that file back to the old name and FTP it to the site and you will be back to where you were.
Carol