Fork in a River

I am learning how to use CC3 and the problem is that I can make a river but when I try to place a fork in the river it always wants to start at the end of the last point of the river which is either the sea or the mountain where the river began. It seems to want to begin an addition to the end of the river instead of an alternate path for the flow of the water.
How can I get it to begin at the point of the fork?

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