You 'poke' a hole with your finger into the run.....may have to dig just a little. smoke bomb goes in the hole...have some dirt handy. Light fuse and cover bomb with dirt so no smoke comes out of the hole. The smoke is heavier than air so start uphill. Put one every 15' or so. Then no more moles. Menards around here sells them. You need the bombs, a very small garden trowel and a 5 gallon bucket of loose soil. Make sure you purchase enough smoke bombs and if there are runs everywhere start with eth fresh runs....