Hello everyone. I would like to create a registration form for a connection with my application on my mysql data but I’m stuck … After much research, I find myself blocked. Someone would have a small solution to help me or guide me to find a solution.
Thank you. 
There is no small solution.
You should build a rest service to call from the app when the user registers.
You need to create API to register users. API will register use to database and you need to use API into application and pass required information to API.
You will not have a website or tutorial site? to help me in order to create my login and register with an external database app. 
Ok, I can, Which coding platform you are using ? I use .net . and asp.net. You can learn more about ionic framework and Angularjs on www.codeandyou.com .