Unless you have an auto-ranging multimeter, each of the basic modes (voltage, resistance, and current) has several settings to choose from. This is the range, which you should set before you attach the leads to the circuit. Start out with your best guess for the value which is just above the closest result. For example, if you expect to measure around 12 volts, set the meter to 25V, not 10V, assuming those are the two closest options.  If you have no idea what current to expect, set it to the highest range for your first try to avoid damaging the meter. Other modes are less likely to damage the meter, but consider the lowest resistance setting and the 10V setting your default. On a digital meter, "OL," "OVER," or "overload" means you need to select a higher range, while a result very close to zero means a lower range will give more accuracy. On an analog meter, a needle that stays still usually means you need to select a lower range. A needle that shoots to the maximum means you need to select a higher range. Turn off the power switch or remove the batteries powering the circuit in order to get an accurate resistance reading. The multimeter sends out a current to measure the resistance, and if additional current is already flowing, this will disrupt the result. To measure current, you'll need to form one circuit that includes the multimeter "in series" with the other components. For example, disconnect one wire from a battery terminal, then connect one probe to the wire and one to the battery to close the circuit again. Voltage is the change in electrical energy across some part of the circuit. The circuit should already be closed with current flowing, then the meter should have the two probes placed at different points on the circuit to connect it "in parallel" with the circuit. This must be done carefully to avoid discrepancy. Analog meters have an additional dial, used to adjust the resistance scale and typically marked with an Ω. Before making a resistance measurement, connect the two probe ends to each other. Turn the dial until the ohm scale reads zero, to calibrate it, then conduct your actual test.
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