While developing or testing your application, you should use test ads. These ads to not count towards your click counts or impression counts. If you have any trouble with test ad units, please contact firstname.lastname@example.org.
Put the following html snippet on your website changing the width and height to the desired values. (Possible ad sizes and values: Ad Sizing)
<ins class="adsbycontextcue" data-cc-site="886fd17c-b3bd-43ad-8d1b-5078d78dac01" data-cc-slot="V7VQIFsj" style="width: 300px; height: 250px;"></ins>
Create a Site (follow instructions here to do so: Sites)
Navigate to the site in the ContextCue Publisher application that you want to put an ad on
Click "ad units"
Click "+ ad unit" near the top left
Add the name. This is just an easy to remember name. Ex. "header test ad unit"
Select the Test category at the bottom of the list
Click "Create ad unit"
Now follow the regular Implementation guideline to put the ad unit on your site.