1. First click invoice designer on the top bar and select your template.
2. In the toolbox bar on the left, drag the "Picture Box" icon onto your template.
3. Click the ">" icon on the top right of the picture box. Click the "..." beside the Image field and select your image
4. Resize the picture to the correct size.
5. Important: in the bottom right "Property Grid", scroll down until you see the (Name) field which will default to "pictureBox1". Make sure you change this to something else, like "pictureLogo". Otherwise the image won't display.
6. Click save at the top left.