Donna - I was mixing it all together in a watering can and then drenching the plants. But now I just sprinkle the epsom salt around the top of the soil above the roots. As far as hydrogen peroxide, I mix it with water and liquid fertilizer typically unless the plant is sick, then I directly squirt the H2O2 on the damaged area.
I use both the Epsom Salt and the H2O2 when the leaves are producing more yellowing or the plant just looks a little droopy. It usually perks it right up. They need lots of water here, but without the Epsom Salt, the leaves turn yellow and drop. The epsom salt keeps them green. You just have to watch how your plant is looking and treat it when it starts looking like it needs a picker upper!
