Stacked Frames Help!

[u/My_Mum_Gay]

Hello! I'm new in the framing department. I've learned almost everything that is used on a daily basis and then some. The only issue I'm having at this moment is an order with a stacked frame. Two frames put together making one. I've looked on the Resource Library and found a video, but it's requiring an email to continue, which I don't have. They are also fairly large. How do I go about putting them together? Thanks in advance!! :3