As a Coach/Mentor/Coachee/Mentee, click on 'People' then 'Search People' and all the users within your organisation that have set their visibility to 'Visible to users only from my organisation' or all users that have set their visibility to 'Visible to all users from all organisations', will display.
If a lot of users are displayed and you want to narrow your search, you can type in their last name or email address in the search box and click 'search'.
You are also able to filter your search for example,by user type, oranisation, location and topis areas.
Click on the Clients name to view their details.