how to set...
To set gelatine, just put the mold in the refrigerator. To add solids, chill gelatine mixture until slightly thickened, to prevent solids from rising to the top or sinking to the bottom. When gelatine mixture reaches the consistency of unbeaten egg white, you can fold in cut-up drained fruits, vegetables, meats or other solids, whipped milk (evaporated or nonfat solids) or cream. Then chill.
For an extra-fast set, first put mold in the freezer for 5 minutes. Or, put bowl or pan of gelatine mixture into a container of ice and water and stir mixture for 5 minutes, until it begins to thicken. Then chill in refrigerator.