How do you make circuit in multimeter to measure current?

Use a shunt made a precision but very low resistance. Place the shunt in series with the ckt. Measure the voltage drop, and do the math.

The ammeter function of most voltmeters uses two ranges- about .25ohms for the 10 amp range, and a higher value for lower currents on the order of 250ma where a larger shunt won't affect the ckt too much and give a more accurate reading. Many meters are damaged when this function is used on low range first with 10 amps applied!