To install and apply a Lyx style-file in a mac

There are some ways to install and apply a style-file in a mac.

 Here
http://slavecache.blogspot.com/2010/09/installing-sty-files-for-latexlyx.html

"for the right directory to drop your files in. Under Mac the appropriate directory is

    /usr/local/texlive/2009/texmf/tex/latex/my_new_styles

Now run sudo texhash (or sudo mktexlsr or texconfig[-sys] rehash) and check with kpsewhich your_style_file if it worked.
LyX should be able to find your sty-files now. "

This website describes how to do it by using absolute path.  But for a mac beginner, he will be very hard to find that path.  We shall change to some other ways.

The following is what I usually use:

1. go to Macintosh HD/Library/Tex  (very easy to do this step)

2. click "root" to enter

3. click "texmf" to enter

4. click "tex" to enter

5. click "latex" to enter

But this is a root directory, which means you cannot make a sub-directory here

Thus we need to find other way out.

6. Go to any other folder rather than here,

7. make a new folder called "my_new_styles"

8. copy your style-file (*.sty) into this folder

9. copy this folder to the place where in step 5 you goes

10.  do "sudo mktexlsr " in terminal

11. reconfig Lyx and restart

Now you can use your new style-file.