Nevermind, everybody. I figured it out.
In case anybody else has trouble with this, here's what I did.
First, I edited PHP.ini which you should have put in the Windows directory (if you use windows) and I changed the Output_Buffer directive to "ON".
Then I had this other problem, where the links weren't working on the Welcome page and the logo wasn't showing in the upper left corner. For this, you have to open the config.inc.php file in wordpad and make sure that you have http://yourdomain.com/phpmyadminfolder
as the value for PmaAbsoluteUri. Mine looked like this when fixed:
$cfg['PmaAbsoluteUri'] = 'http://255.255.255.255:81/myadmin/';