To add the custom chains to my Leap wallet, you can follow the below steps:

1. Click on the top-right chain logo inside your wallet.
2. Scroll down to the bottom of the chains list.
3. Select the option Add new chain.
4. Fill out the details for the custom chain you want to add. (Caution: Only add custom networks you trust.)
5. Click on the Add chain button.
6. That’s it. Your new chain is added now.

To remove the custom chains to my Leap wallet, you can follow the below steps:

1. Click on "Switch Chain" and then click on "Manage Chain."
2. You'll see a list of all added chains, and you'll have the option to remove custom chains.
3. Click on "Remove Chain," and you're done!

FYI, the remove custom chain feature is only available on Leap Mobile.