to add a customer

I manage my server game with smartftp, within with my username
and password from administrator. I want to give to the access to a
my friend giving an other username and password (do not give
administrator, therefore in case of problems I remove it the access).
how it is made?

For this you need to contact your Host!

Beus wrote:For this you need to contact your Host!

it is not possible to make it from the client?

No that is not possible!