Edit plugin fields

Hello, I’m looking at your plugin, and I want to buy the paid version.
Tell me if I can edit the fields, because I don’t need payment, and I don’t need a lot of structure for my friend, something like this:

1 step:
Choose a hall
Choose a date
further —

2 step:
Choose the time you want
(there should be a sign like this from Google Calendar)

Choose the desired additional service
(a checkbox with the possibility of choosing several, there should be approximately 4 of them, where 1 and 2 are the block about light and backgrounds (expanded list), and 3 and 4 are the decor and the photographer)
further -

Step 3:
Personal information
Name
Phone number
Number of people

(checkbox + hyperlink)
familiarized with the rules of the studio (a)
I agree to the processing of personal data