If you look closely, the top of the battery has a "+" mark on it, meaning it's the positive side of the battery. Therefore the bottom is the negative, and it is connected to the short leg of the diode.

When making this pattern, I cut the tape down the middle, this makes it easier to make curves, but you don't have to do that.

You can get artistic here, and shape the traces into fancy curves. But keep the gap you see at the bottom.

I laid a piece of copper tape across the gap, and the LED turns on brightly, since an electrical current can run all around the circuit.

The meter is set to the DCV (DC Voltage) sector, and the scale is chosen to be 20 Volts max.

The meter reads 3.1 Volts.

Note the LED is not on, since nothing is bridging the gap at the bottom.

The meter is set to the DCA sector, which means Direct Current Amperes. The scale is chosen to be 20m, which means 20 milliAmperes max.

[when you use the DCA setting, the meter offers (almost) no resistance to the current, so it acts like our little piece of copper.]

The current reads -3.75 mA.

The meter is set to the sector labeled $\Omega$ (the Greek letter Omega), which stands for Ohms, the unit for electrical resistance.

In our case, the bands are brown (1), black (0), red (×100), which means 10×100 = 1000 Ohms. The last band is gold, which means a tolerance of ±5%, and 1006 Ohms is well within 950-1050 range.