To add traits to already-created Sims, use the cas.fulleditmode cheat or tools like MC Command Center to re-enter CAS. Troubleshooting & Compatibility
Do not use this mod simultaneously with other UI-altering mods that change the trait panel unless specified by the creator.
In the game menu, go to Game Options > Other and ensure Enable Custom Content and Mods and Script Mods Allowed are checked.