Here is the quick walk-through, we will be uploading a video walk-through soon.
1. Go to your User folder in Windows.
2. Look for a folder called AppData and open it.
3. Open the Local folder.
4. Look for a folder called SWTOR and open it.
5. Look for a folder called swtor and open it.
6. Open the Settings folder.
7. Open the GUIProfiles folder.
8. Here you can copy and save UI files you have created and can also drop new files into this folder. If you add new UI files while the game is running, you will need to exit the game completely and reopen the client for them to become available to you.