English to Spanish Tech/Engineering Electronics / Elect Eng Ipad's cover

I am translating the instructions for an Ipad cover and I am not sure about how to translate hinge channel.

Here is the paragraph that I am working at

"To insert your iPad® into the Cover, start
with the Cover’s keyboard facing you.
Then, with your iPad in landscape mode
and the volume control buttons facing out
(the Home button is on your right), slide it
into the hinge cover, making sure it is
firmly in place. For best results, insert your
iPad with the hinge closed and align its
edges with your Cover’s keyboard.