Is it possible to add a logo to the reports?

Yes, it is!

Provided you have purchased a Corporate or Enterprise license, you will be able to give a URL to a logo, which then will be used for report generation.

To set this URL, select the gear-wheel in the upper right corner and change to the "account & billing" section.

At the top of the "Company Details" section you will find the "Company logo URL". Enter there a URL identifying the logo you want to use. 

The validity of your selection you may verify immediately. If the logo appears upon updating the details on the right side of the input box, your are done. All set. In case of an error, you will see the company name instead.

PLEASE NOTE: Best will be a logo with a width of 75px.