Need help to understand Clustering Integration Services

Hi,We have a SQL Server 2014 Cluster setup on Windows server 2012 (This is named instance).Initially while selecting the features, I didn't choose the Integration services. Later I added. While doing the adding features it throw me error when I select the existing instance name.I run the setup file on Node A and choose as new installation and selected the SSIS and same way I did on node B and later selected the configuration file on both nodes pointing to the named instance (existing clustered).Incase if we want to the SSIS cluster, How to do?What will be the issues with doing SSIS clustering