1. Below the article is the About the author were you can see the website address and this link is nofollow.
For this it must be an option in the Settings/Views/Entry Layout/Author section for no-follow links: http://take.ms/9nPB4
2. If you load the author blog page the link for website address is dofollow and for this you can make an option in Settings/Views/Author Layout/Author http://take.ms/difwd
3. If the author write his website address in the blog settings and he is not writing at least 1 article then the url from the Author page must be unfollow. Write at least 1 article and the link will be changing to dofollow.
Please vote if you would like to have this options. Thank you.