How to follow another blog.

It's been awhile so.....I don't know how to follow a new blog.  Like if I like someone comments on another post.  And since I don't see a FOLLOW button...how can I follow someone and how can they follow me?  Can anyone help me?
Also....I see that I have a few peoples who look at or read  my posts on occasion.  Seems like some of the comments I post so not show up.   Could someone please leave a comment, even it'd  to say. "Boring."  I want to see if I can receive comments.  Thanks.