To transfer to a call queue, complete the following steps.
Create A Contact:
Click on "Chat" and select "Contacts"
Next to "Favorites" (or you can create a new group), select the three dots and then select "Add a contact to this group"
Type in the name of the call queue and select it. It is now part of your "Favorites," or the group you created.
Transfer To Call Queue
When you are at your transfer screen, type in the name of the call queue you want to send the call to and then select transfer