We're sorry to hear that you have trouble using the app. Could you please email us a screenshot of the last screen you see before the app crashes at firstname.lastname@example.org and let us know what button you tap on that screen so that we could look into it? Alternatively, please record a video of your device’s screen from launching the app till the moment the app crashes. It would be extremely helpful.
Also, please let us know what device model you are using and what version of OS. Thank you for your cooperation and sorry for the inconvenience!