To add the Alt attributes for images:
Configure the content type to display an image title when hovering over the image to improve user accessibility.
You will also need to add a field to the content item's Author Entry Form in which authors can enter the alternate text (for example, a text field labeled Alternate Text). See Customizing the Author Entry Form for details.
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Click Content Types > All Content Types.
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In the Label column, click the name of the content type you want to edit.
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Click Edit in the Properties area.
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Select a field from the Choose a field to use for the alt attribute of the img tag menu.
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Click Save.
Note: The alternate text provided by the author will not display if an Alt value has been added manually to the page's HTML source.