Ha ha - there is still a bit more work to do ... Somehow, you have ended up with a big white picture with your bike in the top left corner of it!
You must have started off with a big blank image and then pasted your picture onto it? If so, you have resized the whole thing, rather than just the bike!
What you need to do first is to resize the blank white image to a small size by grabbing the bottom right hand corner with your mouse, and dragging it up towards its top left. Then paste your bike picture over it. The bike picture will be bigger than the background so the background will no longer be visible. If you then resize the bike again, you won't have the big white background behind it.
I hope that makes sense?