To get an account you need to download the app Instagram and register. Owners of iPhones can download the application from this link, the owners of phones with Android OS can download the application by clicking here.
Ligaviewer can be used without account for Instagram. You can watch the feed of any user, except closed accounts.
To enter account user need to have an Instagram account. If you have an account, click on the link "Sign in" located in the upper panel and enter username and password.
Personal account gives you more control over your profile:
Follow/Unfollow other users
Unfortunately Instagram policy such that you can add only photos via mobile devices.
You enter your login information via the site Instagram, so no one in any way will not know your password.