I logged onto Instagram in a iPhone at apple store and forgot to log out?

How can I log out of it? Please help!

Added (1). Why this was put in Adolescent. I have no idea.

Go back there

Delete your Instagram account make a new one. Deleting it will deactivate it from the iPhone of the apple store and the signup again so you get everything intact. Other alternative would be to go there and log out. No other option. Sorry.

They may check all iPhones at the end of the working day and log out of anything. But, if not, just go back and log out.

Well, I don't know if this applies to instagram because I don't use it, but with most websites, if you're signed in on one device and then you sign in and sign out on a different device, it signs you out of the first one. Again, I don't know if this works for instagram, but I know of a bunch of websites where it does.

Go back to store? Or change password and it should log out of all computers or delete it and make a new one?