Any of your members can Livestream. You just need to set their permissions up correctly from The Console.
To Livestream, a member needs to have the correct permission for their account and be a Group Admin of the Group they want to Livestream to.
Setting the Livestream Permission:
Go to the Engage section of the Console, click on Member and select the member (or yourself!) who you want to give Livestreaming permissions to:
Hit Edit and toggle on the Can livestream option:
Press save!
Setting the Group Admin Permission:
Next, head to the Member panel of the Grow section in the Console again, scroll down and click on the three dots next to the Group you want the member to become a Group Admin of.
Select make group admin.
Now, whenever the member goes to create a Post, they will be able to see the Go Live! option.
Happy Streaming!!