If you would like to make a donation to Roding Music, you can do so via the PayPal website. Click on the button and follow the on-screen instructions. Before I made Roding Music's downloads freely available, I asked £2 or $3 for each A4 page of music. That may be taken as a guide, though if you think that the music is worth more or less than that to you, that is for you to decide. The reasons why you might want to make such a donation are given under questions and answers.
The picture shows me hard at work at my computer. In the background are files of West Gallery music, and open copies of the hymns of Isaac Watts and the New Version of the metrical psalms.