Once you have reached the required level, you can customise your profile by going to your profile page (click on your profile picture or display name on the top right). Once on your profile page, click on “Customise Profile” on the bar below your profile and background pictures.
Points are awarded for creating posts, commenting on posts, making friends, and joining/creating groups. You can also earn points by logging in daily. Please note that to discourage spamming, users considered to be spamming (after investigating a spam report) will have points deducted.