To add or remove fields simply add or remove lines in the form tab in your Google Sheet.
There are a few things to keep in mind
The Name and Help text columns should be quite obvious. However the name "email" is a special field that is required so don't delete this row. But feel free to change the help text of the field.
Basically the help text is written below the input field in the registration form, as an extra information field for the person signing up.
This defines what type of data we are collecting, Slick events currently only support the following input fields (more are on their way):
The required column, simply insert a "y" if you want the field to be mandatory, otherwise the input field is optional.
To add a dropdown select list simply add a row with the type set to "select", then in your data column just add the different options separated by , - so for example: at the club,at the venue,at the cafe.
Do not update or change your form fields after people have started signing up, if you do the layout of your signups tab will become inconsistent and you will have to manually sort it out and insert / update the columns based on the changes you made to your form.