For EPP-foam planes. Cut a slot and use hotglue, CA or foam-glue to fix the hinge in the wing. Use an pin with plastic-head as bolt. Dry-test it before glueing. This thicker one is 1mm thick, the hinge with the 3L in name is only 3 Layer or 0.6mm.

When using a pin with plastic head, the hinge can be opened again when necessary. All-steel-pins maybe look better on your model.

There is another hinge for R/C-plane without holes. Use that one when you glue your hinge to the surface of the wing.