Is it possible add more information to –

I want to be able to add
a. Customer Name and address to the Shift as per employee (I have contractors) attending for the roster. (Each contractor service their own customers)
b. Able to mark if the customer “Paid” or “Not” manually like “Paid: Yes/No” etc.

Questions:
Q1. Am I able to add a field “Customer Name”. If so where would this appear or can be used?
Q2. Am I able to change the wording “Employee” to “Contractor”
Q3, After adding additional “Calendars” as Active, only 4 showing. I am not able to assign the new calendars to the emplyees. Any idea why?

The page I need help with: [log in to see the link]