Once you integrate Instabug, by default, all bug reporting features should be enabled. This means that you can simply shake the device, or any equivalent way of showing Instabug, hit "Report a Problem", and then send the issue.
​

Right after your user sends the bug report, you'll find it on your Instabug dashboard under the Bugs section. 

You can use the video here to educate your users on how to report a bug with Instabug from inside your app.