How to import your existing RP profiles from another add-on
Total RP 3 has an importer feature, allowing you to import all your already existing profiles into Total RP 3 profiles. You will need to have both add-ons (Total RP 3 and the add-on you want to import your profile from) activated. (You can actually have more than two activated, if you need to import your profiles from more than one add-on).
Once you've make sure they are both checked, log into the game. You may get a message from Total RP 3 saying you should only run one MSP add-on at a time. Just dismiss it, it is okay to have both for now. Open Total RP 3 by clicking on a the minimap button and go to the Character section.
Then click on the Profiles tab. You will see the list of your Total RP 3 profiles. You should see the Characters importer tab on the top. Click on that tab and you will be presented with all the profiles Total RP 3 was able to find.
Click on the Import button next to a profile to import it, or click on the Import all button to import all the available profiles. The importer will create a new Total RP 3 profile for each profile. Once imported, the profiles are available in the Characters profiles tab.