What exactly are you struggling with? Been a while since created that save myself but it wasn't difficult, there's nothing special you have to do iirc, just make sure to not blow Jenna off at any point, especially at the restaraunt with Ellie.
Worth noting though, there is no confirmed path for this pairing btw, I'm just hoping it becomes one, but it does involve cheating on Steph (which will not end well I imagine).