From your UtpFund Member Panel , click on "User Details", then click on "Send OTP to Edit Btc Address". You will receive a OTP o your Mail. Then Enter that OTP and enter your new wallet. Then click on "Submit" and you can see your bitcoin address updated.
If you do not receive the email with the OTP (be sure to check spam/junk files).
Please Note: Make sure that you are entering a Wallet Address and not a Wallet ID. The Wallet ID has dashes in it.