selena_vella on "[Plugin: Add to home screen WP Plugin] Make user login not needed"

Hello,
This plug in interests me...
I do have a few questions at this time:
1.how do I assure that when when the user presses on the icon, *login* is NOT required?
Thank you.
2. When I load the plug in the icon shows up automatically on mobile?
3. How do I choose icon of choice to use with plug in?
Thank you!

https://wordpress.org/plugins/add-to-home-screen-wp/