In order to add an IT energy meter to a property, the property must first have a Data Center property use. This is because a Data Center IT Energy meter is considered a Use Detail of a Data Center. To add a Data Center property use, go to the details tab, in the "Add Another Use Type" box select "Data Center".
Once the Data Center use is added, go to the Energy tab. Now you should see the option to "Add A Meter" from Data Center IT Energy Meters section at the bottom of the page.