Question about Prototype

So I’m using Prototype to design a simple level for my game. However, I can’t figure out how to delete one of the squares in the object I made. Anyone know how to?

Our company could help you
If u are fond of games and want to create your own, write us we will help u!
u will get O. G. S. P. (Own Game Start Package) which include everything u need !
-Working idea in prototype( in 2 weeks)
-Development plan,
-Promotion Kit - video presentation, promotion materials, concept art,
-Publishers Data Base
Increase your Indie budget in 100 times!!!
How? - you’ll get all what you need to make a presentation for publishers, investors, crowd funding platforms etc.

If it is interesting to you, please write me and we will talk about all details!)