The Service tab will show all the parties who have elected to have their email available to be electronically served on the case. If you don't see an email under the party then the party has yet to add their email to case.
Check the emails that you want to serve. Uncheck to not serve the service contact. Click the Fees button on the lower right hand corner to continue.
*Please Note: You should NOT add opposing sides as contacts to a case unless you are adding them from the Public List. If they are not on the Public List you will need to serve them through traditional methods. The Public list and Add New option vary by state. See What is the Public List? (Service Contacts)
Once the emails have been checked for service, click on the blue Fees button at the lower left hand corner.