You can change your referral code at any time here. Just enter your new code and click 'Apply':

You'll be given an error if the code has already been taken.

You can only change the code you're referred under if you haven't placed a bet for 90 days or more.

If you meet this requirement, you can visit a link like this: csgoempire.com/r/CodeHere with 'CodeHere' being the code you want to change to. Once you visit that link, your code will be automatically changed.

If you'd like to know what code you're currently referred under, message support saying "What's my referral code?".

Support cannot manually change codes on request.