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There's a distinction between HBO GO and HBO NOW that needs to be understood. HBO GO is an application with which cable subscribers who have HBO as part of their cable package can access streaming content from HBO online, by logging in with their cable account. HBO NOW is a subscription service that is independent of any cable accounts. You pay around $14.99 per month and you get access to the same streaming content. These are two different applications. HBO NOW is available via the Amazon Prime app, as well as numerous others such as Hulu. HBO GO is not available through any of the apps that provide streaming content. Rather, it's a standalone app that you can download to any iOS or Android device, as well as many others such as Amazon Fire Stick and Roku. Sadly, though, LG isn't one of them.

Currently the only way I know of getting HBO GO on webOS is via the Amazon Prime app: https://help.hbogo.com/hc/en-us/articles/204872107-Watching-HBO-on-Amazon-Prime I am not sure whether you have to have an actual Amazon Prime Video account as well, or if you can just install the app and use the HBO GO part of it. Sadly so many sites and services rely on Adobe's Flash, which is a constantly changing environment, instead of moving to newer more stable platform agnostic technologies. Many manufacturers just do not want to have to keep playing catchup with Adobe.

HBO GO like many of the other Premium channels require Adobe Flash. OS 3.0 doesn't support Flash, so we the consumers get screwed. I should have done more research before I bought my LG. I love the picture quality, but I also bought this "Smart" TV so I could drop the Roku. Lesson learned ;-)