Hello diamondmax!
"Preferences and Options" is the correct menu, some users simply call it "Preferences" for short.
The option you're looking for should be in the "Features" section, here's a picture:
![[Image: plus520multimsn.jpg]](http://i127.photobucket.com/albums/p145/ArcticWolfsAlbum/plus520multimsn.jpg)
Naturally, you'll have to check the box "Allow me to connect to several accounts simultaneously."
Hope this helped.