We then melted the soap. I cut up the glycerin into smaller pieces to help it melt quicker, and my son added the pieces to a microwave-safe measuring cup.
We then placed the cup in the microwave and heated it for one minute at a time. After each minute, we took out the cup (with pot holders!) then used a spoon to give the soap a stir.) We kept checking in on on our soap, and kept stirring, until the soap was liquid-y. For us, this took about three minutes.