I have included a long string of pictures to demonstrate the knot. However I am no master at this knot, it takes allot of practice. It is a good idea to try with thicker rope first. Basically you make 4 loops in the y direction, then 4 loops in the x direction on top of your previous 4, then 4 in the z dirction linking the two previous sets of loops. Then you slowly go from the end of your rope. Tuck the very end inside all the loops and slowly work around the knot tightening as you go. The following Instructables were very helpful when I was first attempting to tie a turk's head: https://www.instructables.com/id/Chluaids-10-minute-Monkey-Fist/https://www.instructables.com/id/Rope-Weapons/
Cut off surplus rope, tie to your keyring using a knot of your choosing. I chose a figure of eight knot because I like its symmetry.