Open WireTap Anywhere, select that device and then click on Settings. Then click on the Sources tab.
"Wire" your source on the left hand side to any output channel you choose on the right hand side by clicking on the "lead" on the source side and connect it to the "lead" on the output side. To remove a connection, select the wire and delete it. To add channels to the output side, simply click on the Plus button in the lower right.
For more complete instructions, open WireTap Anywhere and click on the question mark in the lower right corner to open the WireTap Anywhere Help. Routing audio is explained in the section called Configuring WireTap Anywhere Virtual Devices.