Donation only for registered user

Hi,
I bought Joom donation and I wanted to ask a question. It's possible to enable the donation only to registered users?
(registered user in joomla/kunena, not community builder, joom social etc)

example: lucas donated € 10, € 5 mark gave.

thanks

I found a solution by enabling the donation form only for registered users ... I'm stupid!

But I wanted to know if it was possible to make sure that donation occurs immediately taking the username of user