How to add a component to actor at editing

Hey fellow humans,
id like to know how i could add some meshes to an actor during editing the level. I like to know it the C++ or the blueprint way. I want to make an actor that is able to spawn stuff while moving around but i dont know how to spawn that. I also want to access it later so i could change the position of the meshes. If you have any information about that it would be very nice.

Thats all basic setup that you need adding specified component and set invoking member functions on that. In below, blueprints adds static mesh component for given execution sequence and sets static mesh data member.