If you mean wallet address by wallet ID then go to "Find your wallet address", enter new address, link new address, enter your Coinpot email id, verify your new address by signing a message, and this address will be linked to your Coinpot account.
The "find your wallet address" is on what site? I don't see that at the coinpot website. Yes you sign up with the email address, but a wallet ID is associate, or wallet address as apparently some here are calling it. I need to change that association. Your directions are clear except for letting me know which site I'm on to begin with. Either I'm blind and not seeing it, or I don't see the "find my wallet address" at coinpot itself.
Log out your account in coinpot.co then in the main page you'll see the "Find your wallet address" link below the register and sign in button on a web browser / below the sign in button on a mobile browser.
1. Search the address you want to link
2. Click "Link wallet address" button
3. Enter your coinpot.co email address
4. If found to be existed, verify the ownership of the address by making a deposit or sign a message
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Accurate instructions are available in the site. That's it.