Every Dofollow link make a back-link to your website . But Nofollow link just make redirect to your website.It's not effect to your website page rank in Search Engine.If you are new in blogging , you need to eliminate the Dofollow link from your website.Read More : 6 Basic BlogSpot SEO guide for Blogger
In browser , you can detect the link which is Dofollow or Nofollow using the plugin / add-on in browser such as Mozila Firefox , Chrome (Google).
Read More : 7 Common Mistakes in Blogging
How to install Dofollow /Nofollow plugin in Firefox?
1. In Chrome browser, Click on tools in menu bar.
2. Next, Click on Add-ons .
3. Now , click on Plug-in in the left side of the Add-on Manager page .
4.Search the Dofollow plug-in in search option and result shown in below .
5.Select the plug-in and install it.
6. Now , Restart the browser.
Read More : SEO optimization on your Blog post title using the header Tag
Now, you open your blog or website and check the Dofollow/Nofollow link as shown in below screen shot.If the link is Nofollow , show the link dotted line in border as shown in below screen.
More read : How to Create Free Blog.