How to make a random Weapon spawner of my choice

im making a battle royal based game and im trying to make my own random weapon spawner that spawns all the deferent weapon i want in the game at deferent locations. i want it to randomize what weapon of the chosen weapon list that spawn at the deferent places. i Found 1 Video of how to do it but i dont seem to understand it or i am doing it wrong.

Download something called Universal Object Spawner from Community Content. You can load it with a list of templates- weapons, ammo pickups, etc. and it will spawn a random one from the list. You can set the respawn time as well.