In order to be able to register a monitor or a new trainer we will go to:

Planning --> Monitors --> Instructors List

It will open a window with the list of all the monitors we have, in order to create a new one which is what we want to click on the "New" button as shown in the image provided below.

Once we find pressed "New" will open a window with the tab of the new monitor to fill.

We will fill in this form with the necessary information, such as your name, email, etc. We will have to put the cost that you charge per hour depending on the type of class, in the case that it imparts them. 

And below we will select the days of the week that he works, as well as his daily schedule.

We will click on the "Insert" button and we will have our new monitor created.