To fill out a PDF download, follow these steps: 1. Open the PDF file using a PDF viewer or editor program such as Adobe Acrobat Reader or Adobe Acrobat Pro DC. 2. Look for fields within the PDF that can be filled out. These fields may include text boxes, checkboxes, radio buttons, drop-down lists, or digital signature fields. 3. Click on a field to activate it. A cursor will appear, allowing you to type in text or select options from a drop-down list. 4. Start filling out the form by entering the required information in each field. Move through the form sequentially or jump to specific fields using the tab key or mouse. 5. If there are checkboxes, click on them to select or deselect, or select an option from a radio button group by clicking on the desired choice. 6. For drop-down lists, click on the arrow icon to expand the list, and then select the desired option. 7. Use the formatting options available within the PDF editor, such as font size, color, or text alignment, to customize the appearance of your input if necessary. 8. If a digital signature is required, look for the designated signature field. Click on it, and if you have a digital signature set up, you can apply it. If not, you may need to create a digital signature first. 9. After filling out all the necessary fields, review the form to ensure no mistakes or missing information. 10. Finally, save the filled-out PDF document onto your device or print it out if a hard copy is required.