Place them in a DARK area. If one is not available, place a towel, or other object over the ziplock. To restrict light getting to your seeds.

Though if you are using the papertowel method: seeds inbetween a couple layers of wet paper towels. I would recommend putting them into a tupperware (leave tupperware open a little (allows air to get into container)) then place in a warm area (top of computer screen is good, and then place a towel over tupperware.