You'll have to navigate to the Administration - Steps page. 

On the Steps page, select the Step from the list and click on the MultiTenant—Send To—All Tenants menu option. The Select Category drop-down list allows you to choose from a smaller list of steps. The Search textbox allows you to filter the result list further.  

Using the menu shown above, steps can be deployed to “All” or “Selected” tenants. If you select “Selected Tenant,” the following dialog is shown. Click OK to continue. 

The step is sent to the Tenant, and a confirmation message is displayed in the top right-end corner.