Add virtual machine object.
Here we are going to add one virtual server object, which is accessible from the outer world and in BIG-IP we add three virtual machine which is a web server.
On BIG-IP interface follow "Local traffic – Virtual Server list " then New Virtual Server.
Finally, we have a virtual machine.
Then you can access this virtual machine from a browser.
When you refresh browser again and again then its call one by one “Red Green and Blue server” because in pool setting we have the following configuration.
Take reference from @cbt_nuggets_Video