I never used one as I don’t agree with the idea of a “compass” or “circle” and never felt the need for protection.
However if you want to use one they can be as simple as pointing your finger at the ground and imagine energy coming from your fingers creating a circle of energy around you as you move and then state what the intention of your circle is and say so it is done or whatever wording you want to use.
You could also face each direction and call on an element or spirit to watch over you and protect you during the rite. An example would be to face north and call the element or spirit of the north such as " I call upon the element of fire to join me and watch over this rite, burning all unwanted energies that enter" imagine a circle of fire around you. Continue with each element and their purpose and build the circle of fire around you with each element you call adding power to the circle. At the end of the circle when you have called on each direction, say something like " by my will and the power of the elements this compass is layed, so it is done"
Again I don’t use one as I don’t like them and prefer to use E.A.'s UC instead. I just don’t see the need do seperate and put a wall between me and a spirit.
Also don’t follow my words exact, this is just an example of how simple laying a compass can be.
Follow your intuition and use your own will and energy to lay a compass as you feel is right.
If anyone wants to correct me on anything, your input is welcome. As I said I don’t lay a compass and really have only called the elements once during a ritual before I broke away from structured systems.