I need to create a form out of my custom class

Hello!

I am very new to IntelliJ IDEA. I had some problems with other IDE's so I'm using this one now.

I want to make a .form class out of a Java class that I already had in this other IDE's, but I'm not capable of doing so. I've tried binding the form to the class, reloading, etc. Absolutely nothing worked.

The form is still empty:

But the class is full of stuff:

And if I run the project, the JFrame shows perfectly.

Please, tell me there is an option to refresh the form, because I really don't want to lose all my work :(.

Thanks in advance.

PS: by the way, I don't know why the classes are in red. The run doesn't get any problems, and the "Problems" tab on the bottom is empty as well.