B4J Question Confused with the use of libraries

While new to B4X, I'm certainly no newbie programmer, but I'm having difficulty understanding how the library system works (with B4J to begin with, but B4A later)

I've been looking for some string manipulation functions, so I selected jStringFunctions in the Library Manager and performed a refresh, but there is no change to the Intellisense list of available methods or properties. How should I (for instance) get to find a Right() function offered as a valid construct?
Am i missing something fundamental here?

Stuart