Beloukha Herbicide is not labeled to control moss. Lilly Miller Moss Out for Lawns would be a better option to use.
Per the Rate Table Chart on page 4 of the product label, Beloukha Herbicide is mixed at 1 1/3 fl oz to 15 1/3 fl oz per gallon of water depending on the percentage of solution for the target weeds.
Please view the full application instructions on the product label for your specific application needs.