Here's a 3-minute video on adding borders to images in a text box, using the browser Firefox.

Find more info below the video.

1. These are all the same thing:
   text box | text box area | text-editing screen | text-editing page
   Full Screen Composer / Full Screen Mode

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(Remember to click the Full Screen Mode button!)

2. Many —but not all— categories in your Control Panel have a text box to edit.

Here's the text-based FAQ for how to add images to a text-editing screen.

And this one includes how to add a frame to an image.

3. When adding a border around an already-uploaded image, you can do so from any browser.
   
   However, if you're Adding a New Image from your Computer into the text box and you want to add a border, then Firefox is the best browser. You'll want to click Save and use old editor (up top), then click on the little pop-up yellow box to  Edit Image Properties. 

 
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