Love always finds a way! (On this occasion, it just needs a little help).
You'll need to match candies next to the love hearts so they weave their way along the track to the candy shaped mold. Each heart has a mold dedicated to it, so be sure to check the line it follows.
Sometimes the line will run beneath other items, so make sure to clear the path as best you can.
Reunite the heart with it's devoted mold in the moves given, or you'll need to tackle the level again!