Once you have imported your leads into Live you need to action them.
If you haven't already got a group set up for your leads please do the following.
Click Person and then Create A Group Of People
Tick Applicants and Internet Registered.
Click Save and then name the group.
Then go to Person>Quick People Group
Find the group and click Select.
You can work through the people in the list and reassign them once they have been action.