*To display square images in the widget, upload square images to Instagram. (Instagram has stopped serving square cropped images via their API.)
Step-by-Step Directions
STEP 1: Get your Instagram User ID and Token
NOTE: If you already grabbed these for your sidebar widget, use the same #s.
- Go to This Website and click on Generate Access Token button.
- Sign in to Instagram as normal, and give the site the access to generate your Access Token, (Don't worry it is a safe method!).
- The code generated will look something like this: '1720536514.1677ed0.7de82de9a39e4d898da1d9891b3810c1'
- Your USER ID is the first set of numbers before the first period (.). i.e. 1720536514
- Your ACCESS TOKEN is the whole string: 1720536514.1677ed0.7de82de9a39e4d898da1d9891b3810c1
STEP 2: Setup the Widget
1. In your original theme download folder, you will find a file called Instagram Footer Widget.txt.
2. Open the file using a plain text editor program like Note Pad or Text Edit. DO NOT use a word processing program like Microsoft Word.
3. On the Blogger Layout page, find the Footer and Instagram Social widget area click the Add a Gadget link to add a new gadget. 
4. Add an HTML/JavaScript widget.
5. The Configure HTML/JavaScript box will open.
6. Give your widget a Title.
7. Copy and paste all the code from the Instagram Widget.txt file into the Content field.
8. At the top of the script, find the code: userId: '5560725922',
9. Replace 5560725922 with your USER ID. Leave quotes intact.
10. Next, find the code: accessToken: '5560725922.1677ed0.5d8606cf9d054183be1b090547a41dd2',
11. Replace 5560725922.1677ed0.5d8606cf9d054183be1b090547a41dd2 with your ACCESS TOKEN. Leave the quotes intact.
12. Click the orange Save button to save your widget settings.