Bitcoin signature isn't something permanent, it's generated by your bitcoin wallet each time you need one. To get a new signature you should copy the message from "Sig message" field, enter it into corresponding field of your wallet, get the generated signature and paste it into "Enter signature to confirm" field.

See instructions for the most popular wallets here

It might happen that your address cannot produce a signature. If you're still asked to verify the changes with it, please, contact our helpdesk.
Was this article helpful?
Thank you!