To access Medscape Consult, you must be a registered user of Medscape. For eligible users, Consult appears as the fourth link in the Medscape.com header - beneath the Medscape logo on a desktop browser or accessible via the site menu dropdown in a mobile browser. To access Consult via the Medscape App, you must be running the latest version of the App on an iPhone or iPod Touch. The feature is not yet available to users of the Medscape App on Android or Apple iPad.
To verify that you're running the latest version, navigate to the App Store on your iPhone and search for Medscape. If the first result ("Medscape" by WebMD) has a button labeled "Open" link next to it, you're running the latest version. If the button is labeled "Update" or "Get" then you'll need to update or install the app on your device.