I'm not familiar with this package, personally. Since it looks like bwlabel() is a function of the EBImage package, and EBImage is a Bioconductor package, you might have more luck getting help with this one over on the Bioconductor community page.
https://support.bioconductor.org/
If you haven't already, I'd definitely recommend checking out the EBImage reference docs first, though, since it looks like they're pretty extensive.
https://www.bioconductor.org/packages/release/bioc/vignettes/EBImage/inst/doc/EBImage-introduction.html