[header] How to post a message on instagram [title] Launch the instagram app. [step] 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. [substeps] Some features may be unavailable or work differently if you're accessing instagram from a computer.