Select File > Setup > 
Manage User Profiles. The User Profiles page of the Manage User Profiles wizard is displayed. The Export user settings option is selected by default.
Check the profile name displayed next to Current user profile. This is the current profile.
Select Change user profile and click Next. The Backup User Settings page of the wizard is displayed.
Choose if you want to save profile changes:
To save the changes you have made to the current profile, select Back up my existing settings to the following location.
If do not want to save any changes made to your current profile, select Do not back up, overwrite current settings.
Click Next. The Select User Profile page of the wizard is displayed.
Select the profile you want to switch to:
Select one of the three predefined profiles: Default, SDL Trados and SDLX. Click here for more information about the different profiles.
To use profile settings from a *.sdlprofile file, click Browse and select the user profile that you want to use.
Click Finish. The selected profile becomes the current profile and the wizard is closed.
How to Check Which Profile you are Currently Using