Ibrahim Nadir

How can I make a specific link in WordPress post do-follow?

15 Nov 2012
Windows
Chrome 23
15 Nov 2012 | Windows | Chrome 23

I have been attending a number of guest articles on my website and there are some of them whom I want to give a do-follow link while no-follow to others. Can someone help me how to make specific links do-follow, while leave the rest as no-follow? I’m using Yoast SEO Plugin just in case you want to know. My website is:

http://www.tipnest.com