Hi, i got a Orion 10amp RX regulator off ebay, but it didnt come with the instruction leaflet

I know the voltage is adjustable, but dont know how to do it and dont want to set it at the wrong voltage. The seems to be a removable link that when removed stops the led flashing and turns it solid, but apart from that im lost! Anyone got a link to the pdf or got a rough idea of how to set one up? Iv searched high and low and cant find a thing!
Cheers,
Ben