Add function to social network

I need a 'Friend' feature to a social network. This is for a website that is already developed, but this site needs a 'Friend' function. The project consists of letting the users 'Friend' other users in an organized manner with profile pics. This allows the user to find what the friends are doing and seeing if they have a 'Mission' open. The site consists of MySQL servers, PHP, and Javascript. We need this completed with in 12 days. If interested I will share more details and give a mockup of the 'Friends' page. Best, Tim