Whether you want to make things easier for your users or need them to stay within boundaries, you can find use of the predefined values. 

The User page is an interface for users to enter their information. You can access its' settings on the User info site.

If you want to get into Predefined values settings, first switch it "On" and click on "Define".

You'll have an option to add the actual predefined values and order them on this screen.

After you save your progress, this is what your users will see when they will try enter data into the form.

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