Jay2487 I think the app is just trying to make sure that you are able to use the wallet you're about to unbind again in the future (you many not care about it since it's likely empty but the app has this safeguard).
There is a big blue "Download private key" button beside the "Unbind wallet" button, use that and store the resulting file somewhere. If you ever need to bind that wallet again, you'll need that key file.
Once that is done, proceed to unbind the wallet by typing "I have downloaded the private key" as the instructions state.
This will leave you with no bound wallet. Proceed then to bind the wallet that appears in the red error message. To do this, you'll need to have THAT wallet's private key file OR the mnemonic phrase that was offered during setup. If you have neither of these, you're stuck.