This article will guide you on how to Edit an existing queue.
From the Admin dashboard, click on Call Center and select Call Center Queues.
Under Show Queues, look for the Queue that you would like to edit. Click on the Action button and select Settings.
On the Queue Settings, you can now go to different tabs (Main, Call Routing, Scripts & Call Launch, After Hours Settings, Assigned Users, Skills and Assigned Numbers) of the queue to edit it.