Where is the World Editor Tool? I was trying to complete an assignment for my Digital Graphics &amp; Animation class, and found it awfully hard to find the World Editor. The instructions were very vague. The instructions only say, and I quote: "Go to the World Editor. Checkmark Blend Sky." If there is anyone who can help me with this inconvenience, I will be pleased! Thank you for taking time out of your day/night to help a person who couldn't find a building if he tried!

Thanks!
First make sure you are in blender render:



Then in the Properties Editor click on the blue icon that looks like a golbe, that is the world editor, there you'll find Blend Sky