How do I use the FGameplayTagContainer and Tag Editor?

Thanks. That means I have to build engine from source ?
Not an big deal for me, but seems bit daunting to put such specific game thing, this high in engine hierarchy.

In any case I started using this module, for my project and I must say it is extremely useful I love it. Would love it even more if the ability to add tags was easier, preferably directly in editor (:.