OK going to make an attempt at a guide.
Please add constructive comments to improve the instructions.
Thank you to DarioJames for this guide!
To begin, download the latest version of YAEB Mac OSX .app bot from the website.
The latest version are coming as a .zip instead of .rar as there were issues with case sensitivity being lost in the archives.
The built in Archive Utility.app and Stuffit may report "The structure of the archive is damaged" . If you receive this error I would suggest getting The Unarchiver to expand the zip: http://code.google.com/p/theunarchiver/
So you have the latest file downloaded and copied to folder you wish to run the bot from.
Right mouse click the file and expand with your favorite utility.
Right mouse click the YAEB.app file and select copy.
Select Folder you wish to run the bot from and select Paste Item
Repeat as need for as many bots as you want to run via double clicking on the application via the finder! To run multiple instances via the finder you must have multiple copies of the YAEB.app.