Google: inurl:blog “post a comment†-â€you must be logged in†-â€comment posting closed†-â€comment closed†“[insert your keyword here]†or [your keywords here] "Enter YourName@YourKeywords in the Name field to take advantage." This will bring up lots of blogs where you can comment, just make sure your comments are good quality to make sure they get approved.
Post valid comments and related to the article, refrain from posting "Thanks, very useful" or anything to that effect because chances are, your comment will put into waste. Take time to read the article and pour your heart out when you comment. Moderators would love that bigtime.
Blog commenting is very simple link building process. you just have to find such a blog who has dofollow comment. it means when you write comment you have to put you name in this place you can anchor your text. and in place of your submit your targeted website. when you submit this comment after approval you can see in the place of your name the test anchor with your link. this is called blogcommenting link building process. Please note that all comment should look dofollow.