If it's now just misaligned on the hinges, there are four bolts that hold the whole hatch it in place - loosen them off and you should be able to adjust it with ease.
However, if it's only the cover on the hatch rather than the entire hatch (ie: the cover and the backing bit that bolts it to the hinges), that is held with four screws and some double sided tape - a bit more tricky, but still doable.....look for the thread that talks about replacing the cover with perspex for license plate mounting. That will give you more detail and some pictures.
2011 Blue Ocean SL with 84,000 miles
2015 pack on 12/30/15
Bosch AGM 12v
Ecopia 422+ tires
L1 EVSE upgrade
Superbright LED lighting
2013 sun visors
GT-R map lamp lenses
Altima illuminated door switches