Please go back and click on the referral link you were sent.

On Mobile:
Go to Settings, then to Safari, Look for 'Hide Ip Address', and turn it off. Once you've made the purchase you can turn it back on again. 

On Desktop:
Go to Safari's preferences, Choose Privacy, Turn Off 'Hide Ip Address'. Once you've made the purchase you can turn it back on again. 

I'm afraid you can't send yourself a referral code. If you're not and it's still not working please get in touch.