Brother 4000CN - Manual (Page 89)

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9.
Hold the paper tray with both hands,
align it with the opening in the printer
and gently insert it.
10.
Push the paper tray completely back
into the printer.
Look
11
Do use excessive force on the paper
tray. Doing so could damage the paper
tray or the inside of the printer.
✏ Note
There is an indicator next to the paper
tray that tells you how much paper
remains in the tray. Use this meter as a
guide to refill the paper tray.
11.
When printing A4 or Letter size paper,
lift the stopper on the top cover.