You can now use your scissors to trim off the extra cord close to the last knot that you tied. I trim one at a time and use my lighter to quickly melt the end I cut. Wait a second for the melted cord to cool just a bit and then use my thumb to press the melted end onto the surrounding cord so it hardens as it attaches. You must be careful with this step. The melted cord is extremely hot, and it's possible to get burned, so you might also try using a soldering iron or wood burning tool for the melting step if you wish. Or even use something like a butter knife, the side of your lighter, or the knurled section of a tool to flatten out the melted end of the cord to finish it.
An alternative to melting the ends, is to tuck/pull the ends under the last couple of knots (I have used hemostats to do this on the inside of the bracelet) then trim them to finish. It does work, and is just barely noticeable as the cords add a slight bulge at that end of the bracelet.