https://trisquel.info/en/member
You would set the per month fee to the minimum 5 € on that page. One off donations can be made using this page: https://trisquel.info/en/donate There it gives things like the IBAN & SWIFT for bank transfers.If you want to get a membership via a one off payment, then I'll have to ask other members to speak up and say how that might be achieved.
