There are a few ways to add your signature to the report:

Your signature can be added to the cover page designer as an image directly, or through stationery, or to the back of the report using the Add Photo feature. 

 You can add your signature directly, clicking on Report Settings and click Inspector Signature.

In this window, you have the option to create a signature using your mouse, or add an external signature in the form of an image.

After selecting or creating your signature, click OK to save your changes.