There is no ' separate mark as dispatched' for Private sellers.
Simple Delivery is now mandatory for Private sellers, so when you buy an SD label, it immediately marks as dispatched as eBay require dispatch within 3 days.
If you have used your own postage and not SD, then you need to manually add tracking this way:
- Go to "Orders Paid & Dispatched"
- Click on "View order details"
- Within the "Postage" section there's a small dropdown arrow next to "Track Package" - click on that.
- Click on the "Add tracking" option
- A box will come up with the current tracking number . Delete that and replace it with your tracking.
You may need a laptop / PC and not the app or mobile browser o do the above.
@johncubitt12