The white blocks are Jelly pieces and must be removed, but deal with the chocolate first. Once the chocolate is gone, then you can focus on breaking through the white blocks to help unlock the remaining Jelly at the bottom. The two portals will shift a piece one column towards the inside.
Here is a walkthrough video for Candy Crush Level 67
Thanks to Matthew Dean
Patricia Frederick’s Tips for Candy Crush Level 67
The first priority here is to remove the chocolate. There is a jelly square hidden under the uppermost block of chocolate.