I am working on a document that I cannnot save to box
I'm on a mac, but there should be similar option in windows, in your office app if you click open any doc, do you see a manage storage accounts option? This is where you sign into box. Also did you install office integration? https://e3.boxcdn.net/box-installers/boxforoffice/currentrelease/BoxForOffice.exe 
Hi Jackie,
Welcome to Box Community!
I went ahead and opened a new ticket. A member of our team will get in touch shortly and please keep an eye on your email.
Thanks for posting!
Best,
Ann