Select the People icon at the bottom of the page

Here you will find the Directory on the left and a list of our companies.

If you don't know which company the person you are searching for is with you can select Default Global Address List for all employees in all companies:

Once you select the user you are looking for you can see all their contact information under the Contact tab:

The Organization tab will show you who this person reports to as well as who reports to them:

The Files tab will show you any Files that person has shared with you and the Email tab will show any recent emails from them