How do I whitelist my self hosted wallet using a signed message?

Can you please help replace the current answer with:

To do this, log onto AMINA’s Online/ Mobile Banking:

Navigate to the Crypto tab, and then click on the Custody tab
Click on Deposit
Select the asset you would like to deposit in Step 1
In Step 2 select 'Your Personal Wallet' and click on '+ whitelist other address'
Select signed message & click continue
Copy the message in Step 1
Using your external wallet you would like to deposit from, sign the message you copied
Go back onto AMINA's Online/ Mobile Banking and paste your external wallet address you wish to whitelist in Step 2
Copy the signature hash you generated when signing the message with your external wallet and click continue
If the signature hash is valid, your wallet will be instantly whitelisted.
When navigating to the manage my address page on the main custody page, you should see the whitelisted status of the new address.

For clients using the new AMINA Mobile App & Online Banking (Early Access):

Navigate to the Crypto tab
Click on Deposit
Select the asset you would like to deposit
Choose the option Personal wallet
Click on "Whitelist new address"
Select “Signed Message”
Copy the message in Step 1
Using your external wallet you would like to deposit from, sign the message you copied
Go back onto AMINA's Online/ Mobile Banking and paste your external wallet address you wish to whitelist in Step 2
Copy the signature hash you generated when signing the message with your external wallet and click continue
If the signature hash is valid, your wallet will be instantly whitelisted.
When navigating to the manage my address page on the main custody page, you should see the whitelisted status of the new address.

You can whitelist your external self-hosted wallet by using a Private Key Control Procedure (PKCP).