Blog

Please anybody explain me how to use blog? I do not know how to look and read other’s  posts, how to edit my posts to put them into correct category, how to add comments. I am not experienced  in blogging (I do not like to waste time in the blogs, facebook, etc. Now I need it just because of class asignments). Thank you for help. I am not sure I could find how to read helpful posts, but anyway, I will try.