Adding someone as a favorite will make them easy to find from the “Favorites” tab in your Inbox. If you would like to add a user to your “Favorites” list, first, go to your Inbox. From there, click into the message with the user you are looking to favorite.
Once the message is open, click the “☆” icon. Once selected, the colour will darken (★) and their information will be added to the “Favorites” list in your Inbox.