I am a complete newbie. I am trying to create my Save the Dates and have them printed at Costco. Costco's format is:
4.25 in x 5.5 in with a .125 in bleed on all sides.
I had created the document using different pre-sets and now I do not know how to change the document so it works for the above formatting.
open your file (or new file if you want to start a new job) and choose
File > Document Setup, then enter new values into the Width, Height and Bleed text fields to change the page size and bleed