HP LaserJet Enterprise 500 MFP M525 - Manual (Page 225)

2. Remove the paper from the tray, and discard
any damaged paper.
3. Verify that the rear paper guide is adjusted to
the indentation for the correct paper size. If
necessary, pinch the release and move the
rear paper guide to the correct position. It
should click into place.
4. Load the paper into the tray. Make sure that
the stack is flat at all four corners and that the
top of the stack is below the maximum-height
indicators.
ENWW Clear jams 211