A mould gives something soft a fixed shape, and dream books read it as pressure to fit a form set by others. Turning out a perfect jelly stands for a plan that finally holds together.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.