To give access permissions to a client we will go to:
Customers → Customers
We will open a window with all the clients that we have, we will click on the button "Edit" of the client to which we want to give you permissions:
When we are already inside the client's tab, we will go to the "Access Control" option in the menu on the left, and later to the "Profiles" option in the right window. We will click on the "New Profile" button to give the permissions.
(As shown in the picture provided).
Within this option we will click on the button of the profile to which we want to give access, if all day, only mornings etc. (These accesses will depend on the ones we created previously.)
If we want to know how to create access profiles go to the following tutorial: http://soporte.tpc-soft.com/solution/articles/17000014198/en )