You read the owners's manual?? Best I can do to help...
1. Locate the latch mechanism and insert the key. Turn
the key and press the key-cylinder to release the latch.
2. Push the forward portion of the top upward to open and
continue pushing upward until the top is fully extended.
The careful placement of a broom handle can be used as
an aid in pushing open the top.
You may have to "jiggle" and "wiggle" the bunk to take pressure off the latch while pushing on the button.
Good luck!
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