take the seeds out of the pumpkin and wash them in a colandar in the sink to get all the pumpkin gook (for lack of a better term) you can use dish soap with the water and can also add a tiny bit of bleach to disinfect the seeds, take the seeds and lay them out on a towel to dry, a towel works better than newspapers as the seeds will tend to stick to the paper, put them in a sunny windowsill if possible, if you have to put them outside make sure you cover them with a screen or the birds and squirrels will have them for a snack! allow a few weeks to dry, store them in a container in a dry place donot seal the container as any moister in the seeds will cause them to mold.