Full flavoured app, but...

While the app does more than other readers, the UI is somehow cryptic.
I couldnt figure out how to tag articles (the option is grayed out), nor how to bring up the Tag Editor. I did not find anything using the FAQ on the companys website in regards to this issue, and the instructions are limited or incomplete.
Contacting the support was unsuccessful, I never received an answer.

eyeloose about ReadKit, v2.3.0