If you're unable to create a signature for your deposit address (e.g., if you used a centralized exchange), you'll need to undergo a manual proof of ownership process for that address. Please still submit a pull request with the keystore signature and you will be contacted for further steps.
Upload the bls_to_execution_change_keystore_transaction file generated in Step 1
Follow these steps:
Upload a keystore transaction file to see the message content
Copy the Signature Hash. You will need it for step 3!