To change the background size, choose File >, Document Setup >, Artboard >, then you can select size from the list or create custom size Open the Adobe Illustrator application on your computer. Open an existing document when the dialogue box pops up. Select the layer of the ob… Create a rectangle shape first with a width of 8.5 inches and a height of 11 inches. You can use also any color other than red for its fill an… 1.For example, I have one A4 cover page but I want to add more pages to the document. Go to File>,New Documents>, Then add make the width … Create or open an object you want to measure. Find the measure tool, it might be temporarily hiding under the eyedropper tool. First click is… Double-click the ‘Adobe Illustrator’ icon on your computer to open the program. Click ‘File’ and ‘Open’ to open the document in which … I’ll be more clear. I’m using CS5, I know how to resize objects…it won’t allow me. It won’t give me the white squares used to resize an object. I’m not in Isolation mode. Source.