Can I also include a donate field on this donation form?

Hi there!

On this form:  https://form.jotform.com/90485548402965

I would like to also include a field where a person can enter their own donation amount if they choose. How would I do that? This is currently set up with the different donor levels as "products". Thank you in advance!

The only way which you can set a custom field for your donation is by setting your options in a regular radio button field and with the use of a calculation widget.

This means that for your choices, you will need to make use of a regular radio button field (single choice field) or a checkbox field and then assign amount for each option, and add a calculation widget which then it will pick up the corresponding amount for the choice selected and this will pass the value to your payment field having a user-defined amount.

For you to be able to better understand how it shall work, please check this guide: How-to-Pass-a-Calculation-to-a-Payment-Field 

Let me know if you have any questions.