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If you'd like to add an alt tag to an image you have already uploaded, locate the content item in your course.
Then select the drop down arrow that appears next to the content items name.
Then select "edit."
To edit an images alt tag, right-click on the image then select "image."
This will take you to the Insert Edit Image pop-up page.
Under image description add a brief description of the image or alt tag.
To save your changes, select "update" in the bottom right hand corner.
You have now edited the images alt tag.
To officially save that to the Blackboard page, select "submit" at the bottom or top right hand corner of the page.
Hover over the image to see your alt tag appear.
You have now saved an alt tag to an already loaded image.