If you have SnagIt:
1. Open Customizable PDF in SnagIt Editor.
2. Click the 'Stamp' icon in the toolbar at the top of the panel.
3. In the Stamp panel, search for 'Check'. A variety of checkmarks will appear.
4. Select a checkmark (ideally blue or blue filled so it is brand appropriate). Place it on the empty checkboxes you would like to add.
5. Click the 'star' icon at the top-right corner of the stamp to add the stamp as a 'Favorite' to use next time.


If you have Adobe Acrobat:
1. Open Customizable PDF in Adobe Acrobat.
2. In the menu on the right hand side, select 'Fill & Sign'.
3. Click the 'checkmark' icon in the toolbar that appears at the top.
4. Find an empty checkbox and click the box to fill it with a checkmark.
5. Save and share PDF with End User.