Hi MacG4gal, Running AmigaForever on a Mac is veeeeeeeerrry different than running it on a PC (unfortunately). There is no simple install (yet) and documentation is fragmented and incomplete. I am glad to read that someone is working on a recent guide.
As far as use of .adf files that you asked about, the answer is "NO", it is not a simple drag and drop execution. The .adf files must be mounted as "Amiga Floppy disks" in the emulation to be used. With the emulation running, they will show up on the Workbench desktop as disk icons. Also, the .rom files that load the different versions of the Amiga OS must be selected prior to starting the emulation. I know all of this is of little help, but don't give up. Search for information on the HiToro front end for the EUAE Mac emulation of the Amiga and you will find more help. Since I have a perfectly working AmigaForever v2005 on my desktop PC I am waiting for an easier install process to run on my Powerbook.
Someone here should be able to give you more help, keep trying, and welcome to Amiga.org.