The wax will begin to melt. Make sure your fire is not too big as the flames over the rim of the saucepan could ignite the wax gas. If this happens cover with a lid or a wet cloth to put it out.
Once the wax has melted all the bits of wick string and any sand or dirt will have sunk to the bottom of the saucepan.
Take the cardboard poster roll/tube (cardboard is important as this becomes the wick for your recycled candle), make sure one end is plugged tightly and rested on the ground. It will need to be standing up as shown in the photo below.
Do not try to move the tube when it is full of hot wax as it may pour or explode out of the base of the tube. The tube needs to be fixed standing in place for the next few hours.
Another option for recycling candle wax is to melt it and use it to fill repurposed glasses or jars like the one above to make the more known type of candle. Note you will need to make a ‘wick’ for these candles but any string will work. Use cocktail sticks or sticks to keep the Wick straight as the wax hardens around it. The wick needs to be in the centre of glass jars and glasses otherwise the heat will crack the glass.
The more sustainable path would be to find alternatives to the toxic paraffin wax candles to reduce or remove it completely from the system.