There should be 3 accounts/passwords. They all have the same starting email so they are easy to mix.
1. OutSystems - the one you are using here in the forum. Editable in profile screen.
2. Service Center - 1 of 2 possible Personal Environment accounts, editable in LifeTime.
3. User - one of possibly hundred users in your platform, editable by the modules.
You're sure you're using number 2?