Your Instagram profile shows your basic account information and the photos & videos you've posted on your Instagram. From your profile page, you can edit your account information and adjust your account settings. To navigate to your profile page, tap the 'person' icon located at the bottom-right corner of your Instagram page. To make changes, tap the "Edit Your Profile" button or access more information and choices by tapping the gear icon to access Options. You can write a bio of up to 150 characters on your profile, or add or change a profile photo to import from your phone's library, Facebook, or Twitter. Also from your profile, you can access your Photo Map, which enables you to showcase where you've taken the photos you've shared.
You can access the camera by tapping the center 'Plus' icon in the toolbar at the bottom of the screen. The camera enables you to take photos with the Instagram camera or share photos from your phone's photo library. Here you can take a photo or video or choose a photo from your photo library.
You can use the 'Search & Explore' (the magnifying glass icon in your toolbar) function to find people to follow, search for specific users, and explore hashtags. You can access 'Search & Explore' by tapping the magnifying glass icon in the toolbar at the bottom of the screen, and toggling between the "Photos" and "People" views to explore posts and users, or type in the "Search" box and choose between "Users" and "Hashtags".
The 'Home' tab shows the feed of photos posted by you and by the other Instagram users whom you follow. You can like and comment on the photos and videos in your Feed. Access your feed by tapping the 'Home' button in the toolbar at the bottom of the screen.
The Activity tab (little heart icon) displays likes and comments on your posts and shows you the photos and videos that your friends are liking and commenting on. You can access the Activity tab by tapping the 'heart' icon in the toolbar at the bottom of the screen and toggling between the "Following" and "You" views.
The 'Following' tab shows you the recent activity of the people whom you follow. Tap "You" to see the most recent activity for you, including users who have followed you, @mentions for you, and likes and comments for your photos and videos. (Instagram notes that the "Following" tab won't work for users who follow more than 1,000 people.)