FrostWire version 5.7.1 and higher has implemented a tipping option for those content creators who have added payment information into their torrent's metadata.
When you download convent via the BitTorrnet network, look into the Transfers Window for a column named Tips/Donations. The column will have 4 icons: Bitcoin, Litecoin, Dogecoin, PayPal.
If one of those options is dark blue on highlight, not grey, that means the payment information is contained in the torrent's metadata and all you have to do is click on that button to go to a webpage and complete the payment. If one or more of the icons is light grey, that means the content creator did not include any information about that payment option and it is not available.
Depending on which payment option is available and which one you choose, you will be either shown a crypto currency wallet address and a QR code or will be taken to the appropriate PayPal donation url for the content creator.
If you choose crypto currency, you can copy and paste the content owner's wallet address and paste it into your wallet of choice or web portal to complete payment. You can also scan the QR code with your cell phone and complete your payment with your mobile app.
If you don't know what crypto currency is or don't have a crypto currency wallet yet, this info might help:
Litecoin - https://litecoin.org/
Dogecoin - http://dogecoin.com/
If you choose to pay with PayPal, you will be taken to a PayPal donation page of your content creator to complete your tip right on the PayPal page with your PayPal account.
If you don't have a PayPal account, you can register here free - https://www.paypal.com/
The company does collect fees on money transfers - sometimes from the sender, sometimes from the receiver, and does collect detail personal and banking information from it's users, so pls make sure to read all the rules before signing up.