@LydiaJoystickDeetz First of all you need to have permission to use it (as admin only can work with "Simple Spawners").
1) Use console command "admincheat scriptcommand simplespawners" in menu you need "Custom Spawner" (bottom left in menu) place where is you like, set settings as you wish.
2) Then copy spawn code from here (You need do this one by one, not just copy and paste all that spawn codes). For example to add "Allosaurus" you need to take spawn command from there (for example here "Allosaurus" one Blueprint'/Game/Mods/FENS/Dinos/Allosaurus/Allo_Character_BP_FENS.Allo_Character_BP_FENS') and paste it into spawn code box using CTRL and V at the same time.
3) And click "Add"
4) Select the creatures you want to spawn in the left column.

More you can find in original mod discussion Additional Mod Information and FAQ.