Sometimes it's necessary to manually edit an address in ShipStation so that it's different than the one from your marketplace. However, the corrected address may be overwritten during the order sync process, or if that customer orders again. You can lock so that it does not update to match the marketplace, and saves your changes within ShipStation.
To use this feature, find the order that needs its address changed, and open up its Order Details pop-up. (The order can be in any status and found from either the Orders or Customers tabs.) When the pop-up is open, look for the Buyer / Recipient Info section in the top center.
Then, click Edit to make or review any changes.
Once you've made any manual changes to the address, the address will be locked. The locked-in address will take priority on this order and any future order updates coming in will not impact this specific order's locked address. If you want the order to later update to match the marketplace, just click Unlock Address and update your store. This is on a per-order basis, so any future orders containing this address will not be impacted by a locked address on a previous order.
Then, simply close out of the Order Details pop-up if you don't need it anymore.