How to fit Kenwood Splash Guard

I've just bought myself a Kenwood Chef Titanium KMC010 and am getting to know it. This is the first stand mixer I've ever had.

Anyway I'm having a little difficulty with the splash guard, I don't think I've it fitted properly. ive just had a go at making some pie dough and while pulsing the flour and sugar together some of it was escaping underneath the splash guard. when researching which to buy I can recall reading the guard can be tricky to fit. Is this the case? I'd appreciate advice as to how I might stop this before going on to mix something like iceing sugar

many thanks for your advice