Unable to install 2nd instance on failover SQL Cluster

Hi all,

I attempted to install a 2nd instance on the failover cluster but encounter the error below. So I thought I should have used the Standalone installation wizard instead. After the installation I realise the 2nd instance only exist on the 1st node so I attempt to remove the instance from "Add & Remove Program". 

1) How do I remove the instance completely as I still see it on the 2nd screenshot.

2) How do I install a 2nd instance on a failover cluster SQL 2012 R2 ?

Error: "The SQL failover cluster instance name already exist"