give this a try https://support.box.com/hc/en-us/articles/360044196433-Box-for-Office-Integrations#h_01H3M9ZCQFVHBPWP2A52NKA7MD

Okay.

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