Google announced in early 2005 that hyperlinks which contains rel="nofollow" attribute would not influence the link target's PageRank. In addition, the Yahoo and Bing search engines also respect this attribute.
nofollow is an HTML attribute value used to instruct some search engines that a hyperlink should not influence the link target's ranking in the search engine's index. It is intended to reduce the effectiveness of certain types of search engine spam, thereby improving the quality of search engine results and preventing spamdexing from occurring.
How to Make Blogger Comments DoFollow:
First I would suggest you to make a backup of your blogger blog, we will edit your blog template to add dofollow attribute to your blogger comment section.
Step 1. Login to Blogger Dashboard.
Step 2. Navigate to Layout >> Edit HTML >> Expand Widgets Template.
Step 3. Search for the following code in your template.