Test your Pixel strip using IDE>File>Examples>Adafruit Neo Pixel>Strandtest. connection details in notes at top of sketch.
You can run 1 metre of Pixeltape from the Uno +5V, so VCC to +5V, GND to GND, Din to Digital 6.
You can use IDE Tools>Port to confirm that your Arduino is listed on a Com port as the correct type, in this example PORT:”COM7(Arduino Uno)”.
Upload the Strandtest to check Pixeltape works.
IDE Port check