QUESTION

Ok, una pregunta. I am trying to figure out how to insert a link to a previous post like I've seen done before. You know....some people have certain parts in their posts that refer to other posts, but it's not like "Hey! Click here to see this post"; it's like I would click here to see a post from a year ago - just like regular typing. Make any sense? Can someone please help me and explain to me how to do this?