As a reseller, you can purchase the SSH addon and have it active on your main account.
If you want to add the SSH addon to one of your clients, we need to complete an identity verification process.
Our account management department needs a scanned copy of a government ID belonging to you, the reseller.
After we have verified the identity, please open up a support ticket with the username you wish to have SSH access for.
All activities that person does over SSH are your responsibility, therefore only give SSH access to people you trust, your reseller account will be suspended if they are caught doing something bad.