Help with 123D Design Project.

I have a 3d printing project that is being designed in 123 D Design 3D to be printed. However, I am stuck trying to figure out a procedure. I need to place 12, 5mm holes around a light ring.

If there are any 123D Design people out there give me a shout out, please.

I've worked with 3D modelling packages .. you want to create a ring with holes in it?

I would work on a 2D plane first, create a circle, extend the top and bottom vertices on the vertical centerline, spin rotate extrusion them to get one of the twelve hole segments of the ring, then apply another spin rotate duplication to get all twelves holes. Finally extrude upwards to get a solid ring.