Hey @228Arseniy228!
To get a reference of an actor inside your level, you can use the Get All Actors of Class node, select the actor class from the dropdown menu inside the node, then drag a Get node out of it’s Out Actors pin, leave it’s index as 0, and connect it to the Object pin of a Cast To node. To reuse, you can right click on the As [Example] pin of the Cast To node and hit the Promote to Variable option on the menu that pops up.
Hope this helps 