New to Editor, Few Questions

Hey! I finally picked up a controller for the PC and now I'm wandering into the editor. I watched the 60 min tutorial video which helped with somethings, but I'm already having some problems.

When I try and click new level, I can't input the level size. The same thing happens when I want to change properties and such with the objects. How do I do this? It won't let me click to enter a number, frustrating.

Sometimes I hold shift click to drag and delete, and it won't delete just adds the object instead.

How do you exit the editor properly? I have to alt-tab to close and then gives me an error.

Thanks for anyone that can help! Editor looks super complex xD I've been building custom tracks for Trials HD for two years and this is so much more involved.