Give us an option to change referral codes

I accidentally put a wrong referral code . It’s a bit annoying how that has to now stay forever. I wish I could change it. It should give us like an option next to the code we entered and say “change”!

Hello there!
This would introduce some pretty big flaws…
For example, you insert a code, and mine for 50% of that code’s reward. Then you change it. How do we give the 2nd user his balance? Does he also only get half ($0.5?, that wouldn’t be very fair).