Add a Link to Your Instagram Profile
Launch the Instagram app on your device and then tap the “Profile” button in the lower right corner of the app.
Tap “Edit your profile” and then tap the “Website” field.
Type or paste the link into the Website box and then tap the “Save” button near the bottom of the page. The link appears on your profile immediately.
Add Links to Facebook Posts
Launch the Instagram app, tap the “Camera” button and take a picture.
Tap the arrow button and then tap the services you want to share the photo with — Facebook, Twitter, Tumblr or Flickr.
Tap the “Add a caption” box and then type or paste the link into the Caption box. It’s not necessary to include the “http://” part of the link.
Tap the check mark button to post the image, along with the link, to the selected social networking services.