Build your audience within Audiences then select it on the Criteria tab while creating your campaign.
Navigate to Campaigns > Create.
Select a Property
If more than one property is listed, select the property that will be sending the campaign.
Select a Campaign Type
Create a new Primary Campaign.
Criteria Tab Settings
Enter a name for your campaign for internal reference.
Select the Seed Lists you want included in the campaign by clicking in the blank area of the Seed List field. Read more about Seed Lists.