Remember advanced Google searches!
You can search for filetype:bbx to find your own biblatex+biber-compatible styles!
Example search: nature filetype:bbx
For this example, I will use texmaker, a desktop-based LaTeX editing tool.
In the texmaker menu, click on Preferences. On a Mac, this will be under texmaker > Preferences; in Windows, it will probably be under File > Preferences.
You will see something like this:
The location of the BibTeX file path is circled in red above. Copy all of the information you see here to a secure location in case you want to easily and quickly move between BibTeX and biber.
Otherwise, navigate to the file location on your machine where biber is kept and replace the information about BibTeX with the biber file path. On a Mac, this probably means replacing the string "/usr/texbin/bibtex" %.aux with "/usr/local/texlive/2014/bin/universal-darwin/biber" % (or something similar).