How to remove actors?

Hai,i know,its a dumb question to ask. Ive made my level but i accidentaly placed an actor in a stupid place by accident, how to remove an actor? i know,press CTRL+Z but ive placed the actor,made a HUGE part of the level and found out the actor does not fit,and i dont feel like having to test a level 30 times again,just to remove an actor..
help -..-

Just select it and hit backspace.

Or the delete key.