how do i copy something on my epson et-2800 without using my computer?

You can make standalone copies directly from the printer. Here's how:

1. Lift the scanner lid and place your document face-down on the glass. Align it with the corner guide.
2. Use the 1.44" color LCD display on the front to navigate. Look for the 'Copy' mode.
3. You can adjust settings before starting: Choose Color or Black/White copy mode. You can set the copy quantity (up to 99), and adjust the size from 25% to 400%.
4. Select 'Start' to begin copying. The copy speed is up to 7.7 ISO copies per minute for black and white.

The maximum copy size is 8.5" x 11". It can handle various paper types in the output tray, from plain paper (64-90 g/m²) up to premium glossy photo paper (102-300 g/m²).

If it won't copy: Check that the output paper tray has plain paper loaded (capacity is 30 sheets). Also, ensure you haven't left a previous document or book pressing on the scanner lid, as it might be triggering a sensor.