Open up the Project you wish an add a signature to. Once on the Summary screen, tap the "Add Signature" option. If a signature is already added, this will read “Edit Signature” instead.
Once in the signature screen, tap “Add Signature” to add your signature (or “Edit Signature” if you want to change it). If you make a mistake whilst writing your signature, use the bin icon at the bottom to clear it.
From the signature screen you can also enter your name which will be placed underneath your signature on the final report.