Please follow below steps to change or reset a password of cPanel Client.
Step 1: Login to the WHM (Web Host Manager)
Step 2: Search for Password Modification.
Step 3: Now select the user name or domain name of which you want to change the password.
Step 4: Put the password in the password field.
Step 5: Now click on the change password.
This is how you can change or reset the password.