I'm not Tech savvy(.)

And I just got a recent AWESOME program that I've seen some of my Favorite Artists and even Famous ones using. Its Sai

My Bestest friend in this whole Universe literally UNIVERSE!! Got it for me -^^- and installed it when I was too dumb to figure it out myself lol ^^'

BUT, I'm having a hard time saving W.I.P.s from Sai to my ComputerArt file in my regular drawing files.

I normally can just save it to a Riff file like I do in Corel Paint, but it doesn't have that option in Sai, it says to keep all my layers separate I have to save it to Sai, but when I do and try to open it again to finish working on it a file pops up saving which program would you like to open it in? And even when I click "choose a file" it doesn't allow me to open it In Sai!!!!!

I wish I was Super awesome with computers but I'm not!! >X[ ] Grrrrrrrrrrrraaaaaaaaaaaaaahhhhh!!!!
I only know how to draw and basic computer necessities lP

So I pretty much try to finish a picture once I start it on Sai, so I can just finish save it to Jpeg, Hopefully I'll figure something out V.V'

But I still LOOOOOOOVE IT!!! <3333