To view any saved or reserved itineraries online, first click My Trips in the top navigation bar:

You will see all itineraries for your account, grouped by Active (containing reserved or purchased items; dates not yet passed), Non-active (no reserved or purchased items) or Completed (dates passed) itineraries.
To see a particular itinerary, click on it directly.

You may repeat a trip for yourself (or another traveler, if one is a Travel Manager, Global Arranger, or Arranger) by clicking the Repeat Trip icon to the right of the specific itinerary you would like to duplicate. (On the new page you can rename the itinerary, make any needed adjustments and check for availability.)
On the selected itinerary page, you may perform several actions via the menu:

You may also add another flight, hotel or car to an itinerary from this page, change the name of the itinerary and add frequent flyer numbers to flight itineraries.
Any hotel purchases of Expedia Special Rates or Expedia Corporate Rates will appear on credit card statements with their corresponding itinerary numbers.
Online exchanges may be possible on some airlines, for e-tickets only (shown as Exchange this item when this option is available).
NOTE: Itinerary numbers will appear on your credit card statements for any Expedia Special Rate or Expedia Corporate Rate hotel purchases.