Add lead to Campaign?

Suppose I have a Facebook campaign. I have to add the leads completely manually once I am notified about them.

How do you manually add a lead to a campaign?

I have campaign created, and I have a Lead>Campaign and a Campaign>Lead relationship made. However, I see no way to add the lead to a campaign (other than making a Person Form).

You add the Lead to a Target List. Then the Campaign references that Target List.