Epson Stylus Photo RX510 Operation Manual page 18

To print on an envelope, refer to the Reference Guide.
Keep enough space in front of this product for paper to be fully ejected.
1. Open the output tray.
2. While holding down its locking tab, slide out the left edge guide
so that the distance between the two edge guides is slightly wider
than the paper you are going to load.
3. Move the feeder guard towards you.
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Copying