What is the Share Access option used for?
The Share Access option allows you to retain control of the domain while granting access just to certain domain editing features to your customers or co-workers.
The domain will show up in another account with limited modification options.
NOTE: If you wish to use this option, you need to ask the destination user to
create a separate account with us.
Check out this KB article on how to share access with another Namecheap user.
If you have any questions, feel free to contact our Support Team.