Epson B-300 User Manual page 23

2. Slide the edge guides while pinching their knob to accommodate the paper you are loading.
3. Fan a stack of paper, then tap it on a flat surface to even the edges.
4. Load the paper with the printable side down.
Note:
Avoid adding paper before running out of paper. Doing so may prevent the paper from feeding smoothly.
B-300/B-500DN User's Guide
Paper Handling 23