Then you need to create your profile. Fill in your name and surname, nickname, birthdate, weight and height, etc.
Don't forget to fill in the emergency phone number (could be your wife's, mom's, brother's, friend's, cat's phone number).
People easier recognise you if you have a photo in your profile. To upload a photo you need to tap "Add photo" (in the upper left part of the screen) and choose a photo from your phone.
Once you complete filling in your profile, scroll to the bottom of the screen and tap the red button "Save".