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support the author on read.cash you can send some Bitcoin Cash (BCH) to the author and a small fee (10%) to read.cash for further development.
You don't have any Bitcoin Cash now, so you can't upvote.
You can: 1) deposit some BCH or USD/EUR; or 2) write an article; or 3) write some comments; or 4) upvote via one-time QR code if you have Bitcoin Cash in some other wallet.
Both comments and articles allow you to earn some Bitcoin Cash if somebody upvotes your writing.
Read About read.cash to understand better how it all works.