Go to top right menu and click on Leads
to view all your Leads/Subscribers, on this use search box to filter the result you want to moderate, or click on the headers to sort based on that.
You can use the Action icons located on right side block of every Lead
First, Eye icon is to view this Lead details.
Second icon, Pencil, this will take you to edit page of that Lead where you can modify the Details and other attributes.
Bin Icon, the third one will delete the lead permanantly from the system.