You can add your company logo to you task PDFs, Report etc as follows:-
1. Select Settings > Companies from the main menu
If you have Multi Licence then you will see multiple companies, else you will see the single company displayed. Click on the company you want to set the logo to
2. When you click on the company you will see the setting page, from here you can select the folder icon to choose a logo, you can delete a logo, and save when you have the correct logo added. See picture below - Note: If you are using Multi Licences then you can update each companies logo if needed.
You can also add Company, Address and Contact info as well and additional info and footer information as needed.