How to change the area of spawn for particle emitter?

I’m very new to Unreal. I’ve decided to created a Cauldron and bubbles coming out of it using a particle emitter.

I haven’t been able to figure out how to to configure the area of the emission. So the particles are just going straight up.

How would I go about making sure that the particles are only emitted from inside the pot and not clipping through?

I was thinking of making a plane to act as the water inside the cauldron, perhaps would it be possible to set the emitter to spawn from the surface?