When someone is sharing a post on Instagram, they are presented with an "Add Location" option. This basically gives them the option to check-in at the location, similar to what you see on Facebook.
Tagging IG locations with Social Report
1. Start scheduling your post
2. Head to Advanced Options until you get to Step 3
3. Type in the location you'd like to tag, then select it
You're all set - you'll see your location tagged on your post