Yield? Merge? I don't think they teach these skills in driving school.Oh. Allow me to help you. When you approach a roundabout, yield to traffic already going around the circle. If there are multiple lanes on the roundabout, decide ahead of time which lane you'll need. Generally three-lane roundabouts are used for the busiest 4-way crossroads and work like this. The inside lane is for taking the the road that is ~270 degrees around the roundabout from where you are. The middle lane is for taking the road that is across from where you are. The outside lane is for taking the road directly to the right of where you are. So when you have a clear path to the lane in the roundabout you need, turn right and merge onto the circle in the lane you need. Once on the circle you have the right-of-way. DON'T ****ING STOP! Keep going until you reach the road you need then merge onto that road. Multiple lane roundabouts have solid and dashed lines. STAY IN YOUR LANE. When you reach the road you need to turn on, if you're in the correct lane the line will become a dashed line and it should be easy to tell where you should go.
See? As Sam Axe used to say, it's "easy-peazy". Okay, so it doesn't take a whole paragraph to explain how to navigate a four-way intersection with a traffic light. But it IS better. I promise.