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Open a popup windows when they users press in button DONAR

Hello friends. My name is Sebastián and I am a beginner in custom code elements.

I need to config the button DONAR. In my site, I add a custom code who provided me TODO PAGO. But I want to config this in such a way that users press and open in a popup window the form to complete this.

I think that need to config jquery in the head or custom code site preferences and HTML elements in the custom code. But I didn´t config this. After pushing the button the user go out of my site and then, then need to press back to come back.

Thanks for helping me.
Sebastián from Buenos Aires!.