How do I add a contact? How do I remove them?

Upon opening the app, click the hamburger icon (3 horizontal lines) in the upper left hand corner and then tap “Friends.” Here, you can tap “Invite Friends” to add people from your contact list. When you tap “Invite” next to a contact’s name, you will be prompted to send a pre-drafted invite text message to them that will ask them to approve or decline the invite.