i am using the most recent updates to both joomla and comunity builder.
Please be sure in the future to provide exact release numbers. Most recent is not helpful as often a users most recent is not the most recent.
I see on the profile there is a rating star, but how do users rate profiles? when clicking on the rating stars nothing happens so how do we enable profile rating?
You need to create a new Rating field within CB > Field Management then under Parameters > Access set who can use it. If you want people to rate each others profiles I recommend setting "Vote Access" to "Registered Users" then set "Exclude Self" to "Enable".