Canon LASERBASE MF6500 Series Basic Manual page 48

2
Pull out the multi-purpose tray extension until it clicks, then open it.
NOTE
Do not load the paper without using the multi-purpose tray extension.
3
Gently load the stack of envelopes with the address side facing down and
the flap side to the left. Be sure to insert the envelopes as far as they will
go.
When you load the envelopes, arrange the stack of envelopes on a firm, clean surface first, then
press down firmly on the edges to make the folds crisp.
3-6