i have very little experience in ASX-listed options ( and none with NABtrade )
what is the official expiry-date of THAT particular option ?
some can have long dates ( several months in one case that i owned , before i exercised that option )
in normal stocks , Bell Direct allows orders to persist until cancelled ( or purged ) which might be a year for stocks paying an annual div.
while Commsec allows one month ( but you can manually extend that near the expiry date )
try to find a similar page on your platform .. starting under derivatives ( of the share you are looking for )