Where is the "Forge for Dummies" guidebook?

I can't even figure out how to get started in Quest mode because I can't figure out how to navigate the interface. All of the help files are about playing Magic. I don't need help playing Magic, I need help using this app.
For example, how do I get back to the "main screen" (ie the starting screen or whatever) from the deck editor? Once I go into the deck editor I can't see any way to get back short of closing/reopening Forge.
I go into the Quest deck editor, create a deck, save it...and then after exiting the app and going back to the Quest menu...there are no decks listed.
I can't find any "Forge 101" documentation anywhere. I can find more advanced documentation on how to do all kinds of cool stuff in Forge, but I need the very basics of navigating the app explained to me. Thanks in advance.
For example, how do I get back to the "main screen" (ie the starting screen or whatever) from the deck editor? Once I go into the deck editor I can't see any way to get back short of closing/reopening Forge.
I go into the Quest deck editor, create a deck, save it...and then after exiting the app and going back to the Quest menu...there are no decks listed.
I can't find any "Forge 101" documentation anywhere. I can find more advanced documentation on how to do all kinds of cool stuff in Forge, but I need the very basics of navigating the app explained to me. Thanks in advance.