You get some water, unless you want to spit fuse.
You look at the yarn that needs to be fused, there is a knot, you undo it.
it may look like this or completely two separate yarn ends to fuse.
You then put it in the water like this.
Now your yarn is wet and you set the ends on your yarn almost ready for fusing.
You rub the yarn between the palm of your hands briskly.
Presto your yarn is safely fused.
I hope the pictures were worth a thousand words. Thanks for stopping by!