Access to file denied when I try to save

This only means Adobe Software Engineers continue to fail at making Adobe CC better overall! This SHOULD NOT BE HAPPENING! I never had this problem of saving my work to a drive I have complete control and access to! This is just pathetic! And the worst of all is the awful Adobe Creative Cloud Buggy and broken app that makes everything function worse and slower, which leads to unexpected crashes! The Adobe removal tool to remove Creative Cloud App is BS, because it doesn't actually remove the app! Adobe needs to get their act together, especially since they charge for these apps! It's unreal! 

Are you working in a computer lab at school or is this your personal computer?

An error like that usually means you don't have full access to write to the location your files are supposed to be saved to.

Typically, in a shared user environment like school computers, the IT department would need to be the ones to fix that for you.

It also appears you do not have a site defined in DW. You'll have all kinds of problems with the program if that's the case. Defining a Site is Step #1 to working with DW to build just about anything: https://helpx.adobe.com/dreamweaver/how-to/define-a-dreamweaver-site.html without it, DW doesn't know how to manage your assets corrrectly.