Ad Manager is a tool to manage, traffic and serve ads. It also shows the available impressions and ad positions for future sales and a reporting tool. 

1. Start by choosing the correct web property.
2. Enter the Ad Mgmt area by clicking the Ad Mgmt button on the top navigation
3. Select an existing advertiser or create a new one.  
4. Create a new campaign. 
5. Create an ad package.
6. Add the creatives to the ad package. 
7. If the ad is for GEN or CO, set the creatives up in Google Ad Manager (formerly Dart For Publishers)
8. If the ad is for Liebert or one of our eNewsletters, make sure the ad is QC'd and has a status of Live. 
9. You're all set.