Head to your Settings > Integrations

Click Connect New Source in the top right:

Select eBay from that drop-down list:

Once that’s done, click Save Connection to save those changes.
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Then just login with your other eBay account when prompted:

One thing we do recommend is to change the name of your integrations to match your store names, so you know where each order is coming from! 

To do that, click the Edit button for one of your eBay connections:

Then you can update the Source Name to reflect the name of your store:

Once that’s done, click Save Connection to save those changes.