Hi Nickki and welcome!
Fastest way (by far) will be to drive.
If you don't want to drive, the next fastest way would be to take a bus to the Studios then walk or take the boat from the Studios to the YC. It's about a 15 minute boat ride (from the time the boat leaves the Studios) and a 20 minute walk if you're a fast walker, 30-40 if you like to stroll. Just to let you know, if you walk it, you will be sweaty!
Bob