Actually this is your first thread ever asking help with AdRotate. So if others give you cryptic or useless answers that’s not my fault and not my concern.
Since the images on the link I provided quite clearly shows the ID column I assumed that would be sufficient to help you out. But read on if you’re unsure on how to proceed.
An Ad ID, as the name suggests, is the ID (or identifier) of an advert.
Groups and blocks have those, too.
If you take a look at the page I linked to you’ll see several images. The top one (with red and yellow bars) lists some adverts. Clearly visible in it is a column labeled “ID” (next to the checkboxes) with numbers underneath. Those numbers are the ID’s the widget needs.
If you want to display a group or block, obviously go to the group or block management dashboard and you’ll see a similar column.
Another option is to take a look at this page – https://adrotateplugin.com/page/services/setups-and-upgrades.php
Me or one of my techs can certainly help you out with setting up AdRotate to your needs or even help you manage the whole configuration.