Make sure you are updated to the latest theme version. Then follow these steps.
Copy and paste the following shortcode into your Custom HTML widget.
Insert a 3×2 Instagram Grid for Small Widget areas
If you are using a theme such as Honeycrisp, Meadowbrook, or Mary Kate, you’ll want to implement a smaller version of the code listed above.
|[instagram-feed imagepadding=0 cols=3 num=6 background=#ffffff showbio=false showfollow=false showbutton=false showheader=false disablemobile=false]|