Until recently Adwords only had the ability to add audiences to adgroups, they have just made an update which allows you to add audiences at campaign level. Below is a step by step guide to the video above.
Video Instructions:
First, select the campaign you want to add an audience to.
Then click on “Audiences”.
You will see a red button labelled “+Targeting” click this.
Underneath “Add to” you can choose adgroup or campaign.
Underneath “targeting” select “interests and remarketing”.
Click on select category and select “remarketing lists”.
Next, select the remarketing list you want to add to the campaign by clicking on the arrow to the right.
Scroll down the page and click save.
You’re done!

Adwords Audiences At Campaign Level Infographic
About the author
Thomas Green is a Certified Adwords Professional and specialises in direct response marketing. He has over 6 years PPC experience and has a straight forward approach to what works and what doesn’t!