Click on one of your Instagram Highlights.
Tap the three dots for More “… More”.
Tap on “Edit Highlight” then “Edit Cover”.
Slide to the LEFT, tap on the image icon, and upload your highlight from your library. Tap done when finished.
Repeat steps for the rest of your story highlights.
How to Update Instagram Story Highlight Covers by lindseyhazel on Jumprope.
As far as creating Instagram highlights goes, there are a lot of options for these, I chose to keep mine simple with colors but you can create your own with software like Canva or photoshop, buy some from Creative Market like these, these or these Photoshop templates and of course, you can download free ones from Pinterest.
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