You can only add a signature if it is in image format (jpg, jpeg or png).
1) Access the Project you wish to add a signature to.
2) From the Project Summary screen, click on "Add Signature".
3) On the next screen, you can upload your signature from your computer.
Note: Unfortunately, it's not possible to draw your signature through the web portal. If you wish to do this, you will need to do so through the Site Audit Pro app on your mobile device or tablet.