HP Officejet 150 Mobile All-in-One Printer - L511a - Manual (Page 23)

Load standard-size media
To load media
Use these instructions to load standard media.
1.
Lift the input tray.
2. Lift up the control panel using the control panel latch.
A5
B5
A4 LTR LGL
3. Slide the paper width guide out as far as possible.
NOTE: If you are loading larger-sized media, pull up the input tray extension.
Load media 19