You can't edit the HTML inside the program; however, when you "build" it, it creates all the html files for you. You can then edit them afterwards but you might not be able to bring those edits back into WebEasy's wysiwyg designer. It can import a web site but it's not necessarilly going to be able to import everything .... kind of a "trial and error" situation. I haven't thoroughly explored this feature. It's a good tool for initial designing ... then if you want to get into the "meat" of things and get real fancy (coz you have the knowledge to write html, php, java, vb, etc code) you can then do that.
Yup, been there, done that more times than I can count. Been in the computer consulting/training/programming, etc biz since 1987. If I could have charged a fee for all the time I've spent researching and testing software apps to determine which would work best for my clients, I would be an extremely rich man today.
Here's another app that you might want to look into (not sure of the cost)...
Adobe Dreamweaver
I've used this a few times to make changes to our intranet and you can switch between wysiwyg designer and html code no problem. It is; however, a "higher end" development environment and has a longer learning curve.