A buttom Paypal for each photo!

[Goodtime]

Hi there!.. well, I am new with Coppermine, it's great!, (and I am new with english too.. jaja)
I've to do something special to my job, I'm so confunsed.

I need the photos in gallery have a buttom that allows you buy each photo...with paypal.
I have all photos, with description, name , title, and i need the link to paypal, to buy it.

I dont know how do it. I have read the documentation, FaQs, and search for Paypal, but still can not get it.
I have read something like Photo Shop 1.4.1 Email Paypal Link to Customer.. but i dont understand how to do it.

Please , I need some help, or how to start... thank you very much

Florencia. from Argentina, BsAs