Change the size of the canvas

this question posted in response following article: http://help.adobe.com/en_us/photoshopelements/using/ws287f927bd30d4b1fef992ca12e28aa8015-7 ffb.html

i trying resize image 300 px 300 px.  need scale first , due difference between width and

height, need resize canvas.  having problems getting canvas down 300 px match width.  appreciate @ all!  frustrated.  thanks

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