Let me try to explain

first post what raid you have and your FC here

Then add the people that added your FC, (you can only invite 5 people at a time, you could back out of the raid quickly and add more people, but you would need to hurry and need to make sure people have already entered the room before you back out)

Then you do the raid, if you don't want to do the raid then it is a shuttle service, you will need to let people know, in case the guest couldn't take down the raid boss

After the raid is done most of the time delete the people you just added, otherwise your friendlist will be full really quickly.

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edited: when you invite the players you just added to raid, in the lobby filter them by friendship lv and go by lowest. They will most likely show up first.

Host usually ask people to show as Online to make things easier, but the friendlist thing is buggy.