First of all i am exhausted, I have poured 50+ hours this week into getting season up and running and adding my wolf support so if my spelling is bad or it sounds like I'm on drugs, i promise ill fix it up when I've rested up a bit, until then i hope you can understand this and get it up and running.
Ok first things first.
head to Spouts main page
Scroll down and click "Download the Launcher"
Click save (location doesn't matter)
Launch the spoutcraft.jar by double clicking it, put your login info for minecraft and hit login.