In the Event Manager, go to your Registration Items. Each item can be customized! Click here for information on the basics of creating effective registration and sponsorship items.
Select the item you would like to edit. At the very bottom, there is a box you can check off, allowing those registering for that item to upload there own logo:
Allowing registrant to upload a logo, or company upload logo is easy!
Downloading a company logo or downloading a registrant's logo?
You will then be able to download the image they upload. Head on over to the Images and Logos section in your Event Manager. Here, you will see the image that was uploaded to your site. Click the Download Original button and you are good to go!