It’s quite simple to edit a label, prior to pre-advising the shipment. As long as the label is not pre-advised or downloaded it can still be edited. Just use the pencil icon on the right hand side in the shipment overview.
Once a label is pre-advised/downloaded, this information is sent to the carriers and, after this process it cannot be edited.
If you’ve noticed you’ve made a mistake, and cannot edit the label then you can request a credit using the function in the shipment overview section of SendMyParcel.com.