STEP #1: Convert the PDF file into a screenshot
After you download the PDF file, open it with PDF viewer on your phone. Zoom into the part you want to print, then take a screenshot of it. When the part you want to print is in a full screen of your phone, the better the printing quality will be.
STEP #2: Open MyMemobird app and insert the screenshot
STEP #3: Crop the screenshot to get a better printing quality
When you just insert the screenshot, the printing preview quality doesn't look very good, but after you crop it, you'll get a better printing quality.
Optional Step: Rotate the cut screenshot based on your needs
If you want to print a brush pen worksheet, for instance, it will be better if you rotate it so that you can print it vertically.