HP laserjet m1212nf - Manual (Page 67)

3. Insert the paper into the product, and adjust
the side media guides so they are snug against
the paper.
4. Push the paper into the product until it stops,
and then slide the front media guide so the
tool supports the paper.
5. When finished printing with short media,
remove the short media extender tool, and
then place it back in the storage slot.
ENWW Load paper trays 53