How to apply Google Fi coupon

[Android Central Question]

I got this code from my friend and it is supposed to be best offer that you can find out there ... and I can't figure out how to add it?
CODE: [removed by mod]
PLEASE HELP.
Or give me other code.

 

[hallux]

Are you already a Fi member? If not, you should have a spot to enter a referral code during sign up. If you are already a member, you can't then apply the code.