Upgrading Jamroom to support more Artist Profiles is VERY easy.  When you have purchased your Upgrade License, simply enter the new Jamroom License Code you received after your purchase into the "upgrade" section of the Jamroom Master Admin Menu:

The amount of Artist Profiles that your Jamroom can support depends on the Jamroom License you have purchased - either 25, 100 or Unlimited profiles are supported.

Note: If you upgrade to the Jamroom Unlimited Artist Profile License, then the "upgrade" option will NOT be visible in your Jamroom Admin Menu.