This will vary from design to design but using a classic mold like the one that makes popsicles that look like those in the pictures let it sit out on the counter for 5 minutes before holding onto the individual plastic popsicle mold and gently pulling the popsicle out by the stick. If you're still having trouble, you can dip the bottom of the mold in a bowl of warm water for 10 second intervals before trying again. Both of these tricks will however mean the popsicles melt faster - sometimes, unfortunately, patience is best!