I am using All in one SEO plugin. There seems to be no option to put NOINDEX for Author pages like /author/abc etc. But noindex options for other types are available:
Use noindex for Categories:
Use noindex for Archives: Check this for excluding archive pages from being crawled. Useful for avoiding duplicate content.
Use noindex for Tag Archives:
Also I have an issue with this All in one SEO plugin which is that, there seems to be no way to specify the meta keywords and description for category pages. /category/xx. The plugin only appears for Posts and Pages so you can add or edit meta tags and descriptions...