my buyer wanted a different service to simple delivery ( which was Evri) as they don’t deliver to her address, so I sent it via Royal Mail tracked. Now it’s asking me to dispatch the item and I already have but not via simple delivery
To mark as dispatched you still need to generate the original label. Then go to the More Actions dropdown menu or View Order Details > Postage > Track Package > dropdown arrow and change the tracking. That has to be done on a desktop browser.