I am trying to create a functionality in Craft where the user enter an email and the system is able to tell the user if the user exists or not similar to the attached screen:
I am very new to plugin development, and I am not even sure if I need one, I found this post, which looks very helpful, only thing is I really don't know how to implement it. How to tell if user exists
Should I develop a plugin? And I don't understand the information on plugin website and I can't find an example where there is an input field on the front end.