I guess it has something to do with this node “Get Streaming Level”, but I don’t know How to link to get its Actor
Like I said in the other post, you cannot 
The only way you can talk to actors in a level, is to have the level actually loaded.
Also, it is possible to send information to the level BP ( of the loaded level ) in some circumstances, but it’s MUCH easier to put your level BP code in a BP actor in the level. Then you CAN talk to it easily from other actors.
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You can always do a ‘get all actors of class with tag’, and tag the actor you want to talk to. Be aware that this is not a very efficient method though (since UE has to loop through all availalbe actors) so better to do it before game start and store the result somewhere.
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Not when the actor is in an unloaded level 
Yes, yes… of course
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