Create loading screen

Hi.

I need help with my game. My game is using world composition and i want to create a loadingscreen for it.
I followed this tutorial (the last post)
https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/93543-preventing-player-from-falling-through-newly-streamed-levels

Its working fine for me, but i want to costumize the standard loadingscreen that is displayed.
So i found this:

Release Notes from 4.2
Rendering
New: StreamingPauseRendering allows some rendering to continue while blocking loads complete so that the game does not appear to hang. Default is to display the previous frame with an animated widget in the corner. This can be overridden by providing a custom BeginStreamingPauseDelegate and EndStreamingPauseDelegate.

But there are not tutorials on the internet for this. I think this is exactly what i need.
Does someone know how i use this? Thanks