Instagram iOS recently began testing multi-client account functions. According to some users report that their application has to support this feature. In the bottom of the Settings menu, users can find the "Add Account" button.
After the user has added a second, a third account, you can simply few clicks complete the switching between them. And multiple accounts match, the application will let you know which of your photos accounts received notification (comments and praise).
Previously many Instagram users urged to support switching between multiple accounts in the app, and now they finally got his wish. Other similar services already have such a function, and Instagram users in the use of other accounts, still need to exit the current account.
Prior to Instagram for Android has support for multi-account switching.