Random location points in Nav Mesh Bounds

I’m following the tutorial above at the moment, but I’m at the point where i have to
add a "a get random point in radius " node, however I’m using Unreal 4.9 and this does not seem to be an option.

I’m trying to make my AI character patrol randomly around the nav mesh bounds volume until it sees the player character. Is there any way to to fix this issue I’m having ?