They light instantly with just a touch of flame to the exposed paper end. We recommend using a candle lighter or barbecue lighter or a punk stick...those lighters with the long ends. Fireplace matches work well, too. The ones that are several inches long - not the short ones.
The new 5" sparkler's paper is already exposed. Just stick the pointed end into the ground or non-flammable container filled with sand or stones and light the paper.
Sometimes, you need to hold the flame to the paper long enough for it to ignite. They will light, just have patience.
It's always a good idea to test the sparkler before your big event to make sure you understand what you have to do to light the sparklers so you're not having to figure it out when you're frustrated and stressed.