Referring a Friend:
Step 1: Login to the app and tap on the menu on top left corner of the app
Step 2: Tap on [Referrals] button
Step 3: Copy the "Referral Code" and send it to your friend.
Accepting an Invitation:
Step1: Open App and tap on the menu in top left corner of the screen.
Step2: Tap on [Sign in]
Step3: Tap on [Sign Up]
Step 4: Fill in your details, paste the "Invitation code" and tap on [Sign up] and you are Registered.