When the enrichment process is complete, the prospects will be marked as ‘New’. You can now add them to your campaigns.
Go to contacts
Click on status > New > apply filter
Select the prospects on the left and click on add to campaign on the right.
Select a target campaign, assign a user and click on add to campaign.
Prospects which have already been targeted in a campaign and are still "in" an old campaign can be retargeted in new campaigns, the process of adding them is basically the same as above, with one little difference: Before adding you will receive an error message at the top of the screen:
By clicking on click here you can force add the prospects into the second campaign.
Now you know how to add prospects to a campaign.
After you add your contacts to the campaign, you'll receive a notification in red numbers, you can open it and check if the action was successful: