The Basic knot and the Twist knot can be tied on the inside front or inside back of the ring. Whichever is most comfortable for you. The Bow and Beads style tie in front, and the duo will have a knot on the inside front and inside back. Use smaller string for smaller knots.
The Mixed Twist
Twist two pieces of string together, thread as in Basic. (The provided small .5mm string is required.) Tip: You may want to use only one of your colored strings to thread through the back anchor hole - threading both isn't necessary and is difficult.