Need Help for add new inputs button

Hi there,
I have a problem. I want to create a “add” button like below to add new inputs in form. But i couldn’t figure it out how to. Can you help me please?

Basically you have to use a repeating group, and construct the action add or remove a new register in your database. If you need some professional help in your project, I sent a PM with my contacts.

Sorry, I don’t get it.I am just a newbie here.