Depends on the Pot you use to melt the lead. If its designed with a bottom pour spout, you put the mold up under the spout, and lift a handle to release enough lead to fill the cavity and have a pool of lead on top of the cut-off plate on the top of the mold.
If its an open top pot, then you need a separate "dipper" to scoop up some molten lead and pour it into the mold. The equipment is NOT expensive, and the savings makes it possible for lots of HS and college students to continue shooting on very tight budgets.