You will need to know either the name or email address of the person to add them as a friend. We suggest posting to our forum if you don't know any Striivers in your area: https://support.striiv.com/support/discussions/forums/3000000440
In the Striiv app, tap on the upper left to open the app menu, then tap the "Find Friends" function - you will need to have a Striiv device paired with the app in order to gain access to the friends function. Added friends will be sent a notification within the "Find Friends" or friends search function in the app, with a prompt to accept or decline the invitation to be friends. Once the friend accepts the invitation, they will appear on the friends timeline seen on the app home screen.