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How to post a message on instagram
Launch the instagram app.
Pull up the instagram app on your smartphone or tablet, or, if you're using a pc, visit the instagram website. Make sure you're using the most up-to-date version of instagram to take advantage of the program's newest format and features.
If you don't already have an instagram user profile, go ahead and sign up for one. Some features may be unavailable or work differently if you're accessing instagram from a computer.