How do I include the style file …sty for the TEX paper I prepared for… journal?
If you are wise, you probably don’t. TTH often can’t handle complicated journal formats for [La]TEX without modification, because they frequently use newdimens, newboxes, category code modification or other unsupported constructs. Instead, look at your TEX file, or the TTH messages telling you which commands are unknown. Decide which of the journal’s specific commands or environments you used or need. Write a little style file that defines them to do something simple and sensible, or translates them into standard LATEX commands. Or ask the journal to provide such a style file! If you are a journal publisher, distribute your simplified style file to your authors.