How to add a new e-file

I've been using TurboTax for years! However, this is my first time using TurboTax Online option which was offered as I was installing the software on my computer. I can't find how to add a new e-file for another other household member, just I was able to do with the Desktop version in previous years. The TurboTax Premier I purchased from Costco states it includes "5" E-files. I just can't figure out how to add a new e-file for another household member. Any guidance is greatly appreciated.