I've tested the app but when it sends emails, it adds a funny picture/link at the bottom of the email. How can I get rid of that? Thanks

What you are seeing there should be a banner advertising that the e-mail was generated with the free version of Logicity and that banner is removed if you upgrade to the Pro version. If you are not seeing the banner you might need to tell Outlook it is OK to display the images (by default Outlook won't show images that pull from the Internet).