For certain marketplaces, like eBay, you have to change your password on a regular basis for security reasons. Alternatively, you may decide to change your file structure on a platform such as OpenCart, and will then need to reconfigure your settings for the store connection in ShipStation. Luckily, it's very easy to do this!
Head to your Account Settings (the gear icon in the upper right).
Next, select Selling Channels and then Store Setup from the sidebar on the left.
Here, find the store for which you want to reconfigure the connection settings, and click Connection under the Actions heading.
You'll then be presented with the setup process you originally faced when you first set up your store's connection as well as instructions for obtaining the needed configuration information. Change whatever information you need to change, test the connection, and then save your settings by clicking Finish.
That's it! You have now reconfigured your selling channel settings for ShipStation!