Yes! You can donate to others. I just added a link next to where the BananaBucks total is displayed, that reads "Donate", that should make it easy.
Click that link to send the person some of your BananaBucks.
You can think of it as "Pay" or "Donate", because it's basically a transfer from you to them.
Apologies in advance if I am slow to reply to your PM. I suggest posting in the forums for support if you need something urgent.