Hey! Thanks for your interest in Easy Feedback! We've tried to build the asset so it's accessible for both technical and non-technical folks. To address your questions:
1. This one is pretty simple! In fact, the demo scene in the asset includes an example using a button to show/hide the form. In short, you can use the OnClicked event from the Unity UI button to call Show/Hide on the Feedback Form component on the Easy Feedback prefab.
2. Yep! It's all regular Unity UI stuff so it's totally up to you how you want to build/customize the form. We've tried to make it as easy as possible to add/remove fields, too!
3. This does require some coding. But, we provide an AttachFile method to allow custom report attachments in addition to the default log and screenshot.
Check out the documentation for more detail: https://aesthetic.games/easy-feedback/docs/release/index.html