Update README.md

README.md

 # Matrix Blog
-A js-script for matrix js api that will make a simple blog view of a matrix room
+A js-script for matrix js api that will make a simple blog view of a matrix room.
+It logs into the room as a guest so the room needs to be publicly viewable.
 
 ## Prerequisites
-* Create a user
-* Copy its access key (found in the settings panel in the angular client)
-* Join/create the room you want to show in the blog with this user
-* Update index.html with the info
+* Join/create the room you want to show in the blog with this user.
+* Set it publicly viewable. "Who can read history?" -> Anyone
+* Update index.html with the info.
+
+## Setup
+ var blog = new MatrixBlog({
+    selector: '#chat',
+    room: '#blog:my.host.com',
+    homeServer: 'https://my.host.com:8448'
+ });
 
 ## Matrix
 An [open standard](http://matrix.org/docs/spec/) open standard for decentralised persistent communication.