1. Upload membership_levels.php to your site.

2. Run yoursite.com/membership_levels.php first to get a listing of membership level ID's

3. Open membership_upgrade.php
    -Change the number '3' to the ID you got from membership_levels.php
    -Change the date starts and date expires to current dates
    -if you don't want the memberships to ever expire remove:
     , `DateExpires` = '2013-09-03 17:05:33' (Yes remove the comma in front of DateExpires too)    
    -Save the file.
    -Upload membership_upgrade.php to your site.

4. Run yoursite.com/membership_upgrade.php

5. Remove these 2 files from your site for security reasons. IMPORTANT !