To leave a message click the topic you would like to go into and click new post.
To read a message simply click the message you would like to read.
To read a reply to a message simply click the reply.
To create a reply click the message you are replying on and click reply under new post.
When reading message small arrows indicate more text below.
Click + (top right) to see more messages and scroll buttons for extra text.
When you wish to return to the topics click the red bar with the subject title.