[EasyRider]

What I want to know is how do I load the missions I made, into hyperlobby so I can play them with other people.

It is exactly the same procedure as going into Multiplayer when off-line to play alone off-line in a coop or dogfight.
enter Multiplayer,create a server and select either dogfight or coop and then select a mission just like in single mission or campaign mode.

When in HL you select the highest slot open and then must wait for at least one other person to join before you can start your game,from there follow the prompts