I want to relocate the Profiles folder to different directory - how can I set FF4 to the new location

I would like to move the Profiles folder from c:\Documents and Settings\username\application data\mozilla to another location to facilitate easier data backup. What do I change in FF4 to identify the new storage location. Reading the backup info in Help makes no sense. They say to completely close FF4 and then use the Firefox Profile Manager to add a new profile. What does this mean? If one closes FF4 how do you use the Profile Manager and where is it? There is nothing in the Task Bar that identifies a Profile Manager. Very Confusing. Thanks, Jim