Ireland--Kilkenny to Cashel & back (need info!)

hi. will be arriving in Kilkenny (from Dublin) midday March 13th, staying there and heading on to Cork on the 15th. I would love to get over to see the rock of cashel, but cant seem to proficiently navigate the bus website to see my roundtrip time table options...or even if a Saturday or Sunday visit is possible.... anyone able to help me out, or give me the page link on bus eireann website that will answer my Q? many thanks in advance!!

I had a quick look into Bus Eireann's website.

If you're travelling Cork-Cashel, check route number 8.
If you're travelling Kilkenny-Cashel, route number 7 from Kilkenny to Mitchellstown, then onto route number 8 for Cashel.

Here's the link for the route planner. Hope that's helpful.