It should be pretty straightforward to add paper to your printer. But like feeding a baby, there’s a right end and a wrong end to feed paper into your printer. The paper goes into a feeder tray either near the printer’s bottom or sticking out the top.
Confirm that you’re putting the paper in the proper way, either face down or face up. Most printers have little pictures on them that tell you how the paper goes into the printer.
Always make sure that you have enough printer paper. Buying too much isn’t a sin. Although your printer can really churn through paper, paper isn’t that expensive, so you won’t go broke.