If a logo image is displayed on your company / group / personal page, you can usually save it on your local computer with a web browser:
You can now use the [Browse] option in the Web form to upload the logo from your computer to the CCL server. Find the logo file on your computer and open/select it. This should place the path to the image file in the file upload field on the CCL form page:
You can also find the URL (Web address) of the image file.
If this does not work: