Go to your Facebook business page.
If you don't see your Instagram profile here.
Go to your Instagram app.
Change your profile from personal to business.
Your image should be 1080x1080 px to fit the Instagram format.
I use Canva.com to make fast, great looking Instagram posts.
Instagram does not support website links in the captions.
You can place a website link in your Instagram profile bio.
As a local business you should enter the geographic area you serve here.
Pick a date and time and click "Schedule."
Your post will now auto post on Facebook and Instagram.