YouTube lets you add Video Annotations to your video as a way to add background information and commentary about your video. Using Video Annotations, you can link directly to your Indiegogo campaign page, instead of having to bury your campaign URL in your video description.

To add your Indiegogo page URL to your YouTube video:

• Login and view your video on YouTube
• Select "Annotations", in the menu above your video
• Click the "+ Add annotation" button
• Type the text you want to appear on your video in the field provided
• Check the "Link" checkbox and choose "Fundraising Project" from the drop-down menu on the right
• Add your Indiegogo campaign page URL in the field provided below
• Click the "Save" and "Publish" buttons

When finished, your Annotations settings should look similar to the screenshot below:

For more detailed instructions on how to add and edit video annotations, please see YouTube's Help article:  Creating or editing annotations