How do I transfer credit to clients?
Adding Credit
You can transfer credit to your reseller clients using credit from your account.
In the reseller area here https://dashboard.clicksend.com/#/reseller-referral/reseller
Select the Transfer Credit button 
You will then be able to choose how much credit to transfer to their account balance.
Removing Credit
Use the same method above to remove credit from your clients account.
Just minus the amount '-$10.00' and it will be transferred back to your account balance.