I've purchased from doversaddlery as well, but the second time around I purchased from Eqyss directly because I wanted to try a few of their other products such as the Rehydrant Spray and Survivor, and dover was out of stock. They ship pretty quickly though. Eqyss is taking forever (they're in Cali and I'm in GA).
As far as how I use it... I mix it with a little emu oil and put the mixture in a small jar (for easier application). I usually "grease" my scalp with this mixture every day or every other day. I'm thinking of trying it on the length of my hair like a conditioner at least twice a week. I've been getting excellent growth with the scalp method though. Google "emu oil".... it's a very penetrating growth oil.