If they aren't listed in either of the areas shown below, then unfortunately we don't support those specific cloud assets currently.
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The EC2 Dashboard might be listed under Recently visited, if not to view all EC2 instances you'd first head to Services:

Select Compute > EC2:

This will then open the EC2 Dashboard > Instances:

Selecting Instances then opens this page where you can see all present EC2s and their state:

To view all Route 53 domains you'd first head to Services:

Select Networking & Content Delivery > Route 53:

Clicking on Route 53 will then take you to this dashboard where you can check for any Route 53 domains on this account: