Water plugin

Hello,

How do you split the river spline so it can break off into steams or just break apart, divert and return to main river again.
I have tried making a new river actor and trying to ctrl+click the other river spline and connect them, that doesn’t work.
I tried alt+lmb drag , but that doesn’t work, just creates a new point between the 2 spline points I want to split.

Any help would be much apricated.

Thanks