Step 1
On the side of the Rebel XTC clip you will find a Female type connector where you can connect your type A or B Virtual dummy sim Adapters.
you will find a Latch in the end of the connector and want to pull it out towards the right as in pic below.

Step 2
Insert the end of the virtual dummy sim adapter with the Gold contacts Facing up.

Step 3
Slide in to the Rebel XTC Clip and slide in till your dont see the gold anymore on the dummy sim connector

Step 4
Close the Gate to Secure the Connection by pressing to the left as in picture below.

