​SharePoint 2013:

How to Modify an Existing Column

1. From the home page of your SharePoint site, open any list or library you would like, in this example I will open my "Documents" library.

2. At the top of the page click Library to expand the ribbon.

3. In the Settings section on the far right click Library Settings.

4. Scroll down to the columns section and click on the column you want to modify, in this example I will click on the "Purpose" column.

5. The column can now be modified but first make note of the other settings you can update; I will add an additional choice called “Internal”.

6. Click OK.

You have now modified an existing column.

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