I'm running Windows 7 and just installed MyFolder 2.5.  It looks easy enough to CREATE a new folder, but it won't let me control an existing folder.

And is there a way to put MyFolder access in the right-click menu of a folder?

Thanks

Thank you for the new feature requesting. We will include protecting of existing folder in the next release.

Context menu is already working for protected folders: right click -> MyFolder Lock/Unlock. (It should work for versions starting from 2.5.1)

MyFolder 2.5.5 was released with this feature. Now you will be able to protect an existing folder.