SkedSocial is an amazing Instagram scheduling app that I have been making use of for the last two months and I am so impressed with how user friendly and effective it is.
This video will show you how to sign up and connect your Instagram account, as well as how to add new posts and schedule them to post on Instagram.
Please note that SkedSocial is a paid app with a 7 day free trial. Membership starts at $25/ month for one Instagram account and you can schedule unlimited posts.
If you have any questions please let me know in the comments!