If your estate agent has added you to more than one property transaction, you can easily switch between them from your online dashboard.
When you first log in using the link sent by your estate agent, you'll be shown a list of your available transactions. Simply select the property address you wish to access.
If you're already viewing a transaction and want to switch to another one, click Change Transaction next to the property address. You'll be taken back to your list of transactions, where you can select a different property.