Why does my multimeter always show a value of 1 for resistance?

I have a brand new multimeter, but any time I set it to resistance mode (any setting) according to the user manual, it shows 1 in the leftmost digit, and the decimal point will move around based on which setting I chose (but the remaining digits will never set to 0.

I've connected the positive lead to the VΩmA jack and the negative to COM. The output does not change when I connect the leads to opposite ends of a resistor.

Am I doing it wrong, or is my meter defective?