How do I create and use a SEN account to access the Sony Internet service on my TV?

A SEN account cannot be created on the TV itself; you must use a computer or smartphone to visit https://account.sonyentertainmentnetwork.com and follow the on-screen instructions. Once created, select the Sony Internet service icon on the Home Menu and sign in using the on-screen instructions. Note that these services were scheduled to become available after a software update in spring 2015. (Page 2)