Not a problem, you can save and edit your package as frequently as you want. Your package will not go live until you click the button that says "Make Public" on your package page.
To edit all of your private and public packages, sign in to your account on CaterCow and go to your dashboard by hovering over your name at the top right corner of the website and click "Dashboard". Then, click the tab on the left that says "Packages".
Click on the package you would like to edit and then click the blue button that says "Edit" at the top of the page.
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