I have a 2006 kia armaniHow can I fix the trunk

SOURCE: gas cap release button is broken on 2004 kia optima

if you can some how manage to get it opened, spray some lubracant on the button inside the door. if not you'll need to replace the release cable.

SOURCE: trunk release button on door does not work

either the motor for the release is bad or there is no power to the unit for some reason. that's the best I got.

SOURCE: 2006 Jetta 2.5 trunk latch operate when really cold

you need to remove the trim cover on the inside of the trunk lid. it sounds like the solenoid is jamming. the solenoid should flick out against a lever that will release the trunk lid and then return back again within a split second. if it stays out then it is jamming, and thus holding the truncks locking mechanism open.
the solenoid may also jam shut and therefor not release the lock. if you can see this happening then replace the solenoid.

SOURCE: 2004 Kia Optima LX gas door and trunk lid will not open using buttons on drivers sdie door?

Check that you have the trunk unlock, open the trunk and look underneath the trunk itself, you should see a switch for lock and unlock,