I couldn’t have said it any better than they did in this article…
Go to Central Admin, and Central Administration, (It is recommended to do this in the server that you installed SharePoint, however I was unable to when doing so, so I went to my local machine.
Start the service User Profile Services
The rest I got from the link from above
Click "start" on "User Profile Synchronization Service" 
Click "OK" 
Click on "monitoring" on left hand side and then click on "Review Job Definitions" 
Click on "Running Jobs" on left hand side 
You should now see ProfileSynchronizationSetupJob running 
Keep refreshing until it disappears and then you’ll notice it’ll disappear. Click on "Job History" on left hand side, you should see the job with status of Successful. 
In Windows Services you should now see Forefront Services both started and running under your administrator account. 
Click on "Application Management" then click on "Manage service applications" 
Scroll down and click on "User Profile Service Application" 
Click on "Configure Synchronization Connections" 
NOTE: you may see the below error, if you do simply do an IISRESET 
Click Create New Connection 
Fill in details 
Click "Populate Containers" button then expand tree and select "Users" OU tree node and then click "OK".
NOTE: Clicking "Select All" does not work in this build! 
You should now see a connection in this list.
NOTE: if you get to next screen and nothing shows, please ensure both Forefront Windows Services are started. 
Go back to "User Profile Service Application" page from "Manage Service Applications" 
Click "Start Profile Synchronization" 
Select "Start Full Synchronization" then click "OK". 
NOTE: this will take a few minutes as a job is scheduled to do this. 
Now if you click "Manage User Profiles" you’ll see the User Profiles coming through 
In Beta 2 it is normal to see these warning errors in the Event Log. 
Also note that you cannot edit the connections because of a JavaScript error. 
For more information on the User Profile imports go to:
C:\Program Files\Microsoft Office Servers\14.0\Synchronization Service\UIShell\ and run MSIISClient.exe 
If you get this error:
"Cannot navigate to the requested page while User Profile Synchronization is running. Please wait for the current Sychronization run to finish."
You will need to restart the machine (you can most likely just restart the services too)
Cannot navigate to the requested page while User Profile Synchronization is running. Please wait for the current Sychronization run to finish.”
i have this message and restart machine but no changes.