The third fin slot is facing down, the side with no slot is facing up.
You glue the angled "side" fins using the jig.
The inset picture shows the glue application.
When the fins are slid into the slots, you'll have some glue squeeze out along the joint. I removed the assembly from the jig to pick up the excess glue with a Q-tip. Best to remove the excess now than try to smooth out dried glue later.
Set the fin/body tube assembly back in the jig to allow the glue to dry.
I applied glue fillets (on one side of the fin joint) while the assembly was still in the jig. After that dried, the body with two fins was removed and a glue fillet was applied to the other sides.
Many builders don't continue the glue fillet/fill under the ends of the fins at the trailing edge joint.
Left - Glue applied,
Right - Excess glue removed.
The same end fill can be done at the front and back edge joint of launch lugs.
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