To edit another traveller's profile, you must be a Company Administrator or a Travel Arranger.
As a Company Administrator you will be able to edit all profiles.
1. Go to User Avatar > Admin
2. Click Profiles, then Edit next to the profile you want to edit
As a Travel Arranger you will be able to edit only profiles to which you are assigned.
1. Go to User Avatar > View Profiles
2. Click Edit next to the profile you want to edit