Got my first JAL flight coming up in December (not including the time I was rebooked on JAL due to a typhoon), travelling from BKK-HND in PE.

It was booked through American Express travel, which obviously has no option for seat selection at the time of booking. Is there a way to select my seat now that I've made the booking? I've tried putting my reservation code into the "View your reservation" page on the JAL website, but it doesn't recognise it.

Also, I read somewhere that lounge access is "by reservation" in PE. I don't have any status with OW (mostly do SkyTeam), so I won't get access otherwise, do I have to do anything to make sure I have lounge access at BKK?