How to get a Recorded Voice into my new iMac?

On my old iMac I would input my recorded voice through a preamp and then into the line-in. The connects (below) made this possible. With my new iMac I am wondering how I can do this as there is no line-in. I am using a TUBE Ultragain Mic200 preamp with Rode and Sennheiser Microphones.

I'd be indebted to a kind soul offering me some help. I want to use the audio in Audacity/FCPX.