In order to recall an expense claim you have submitted to your manager you can access the claim by clicking Authorisation from the dashboard as shown below.
This can also be accessed from My Claims in the menu bar.
You will be presented with your claims at authorisation level. By clicking the claim number or pencil icon, as shown below you can enter the claim.
Once inside the claim you will be presented with the Recall button.
Once the button is clicked the claim will then appear back in your draft claims to edit and then resubmit.