Alternate layers of the orange mixture and cream mixture in your popsicle molds. You can keep the layers distinct for that classic creamsicle look or gently swirl them together with a skewer if you'd like a marbled effect.
Insert the popsicle sticks. Depending on the mold you are using this may be done before you fill the molds
Freeze for at least 6 hours, although overnight will give you the best results.
If you're making extras (which I highly recommend), wrap each popsicle individually in freezer-safe popsicle bags or cellophane wrappers before storing them together in a freezer bag. They'll stay fresh much longer and won't stick together.