GIMP how to increase the size of the image without scaling it

Let say you have a GIMP image of size 100,100

you want it to be 200,200 but you dont want to scale the original pic, you just want extra space for your image, here is how you should do it

1. ON TOP, under IMAGE->CANVAS SIZE
- set your size to 200,200

2. Right click on your image, LAYER TO IMAGE SIZE

Hope it help, it is very difficult for me, I am noob