Is there a release trunk button inside the car?

I'm not sure what you're definition of trunk latch is so let's cover all the bases.

The trunk latch mechanism is inside the trunk well. When you open the truck lid, look down, right in the middle of the back lip that you would have to lift things over to put them in the trunk. The latch mechanism is right there in the middle. While you are looking in the location, look just to the left as you are standing behind the vehicle, and you will see a handle kind of like the pull handle on the end of the cord for your walk behind mower. That is a glow in the dark, emergency pull release for the trunk latch. If you or a child ever got caught in the trunk for some reason, you can pull that handle to manually operate the trunk latch to allow you to open the trunk lid.

On your key FOB, you have a trunk release button as well. If you push that button twice within 5 seconds, the trunk latch will release. You also have a trunk release button to the left of the steering wheel. It's a round button with a picture of a car with an open trunk lid. You can push that to open the trunk lid as well. To use the button inside the car, or the one on the key FOB, the car must have the transmission in park. It will not release the trunk latch if the vehicle is in gear.

I have a 1996 Mustang and my trunk release button is located on the inside of the Glove Compartment, it is yellow and on the left hand side of the Glove Compartment.

CHeck the fuses, also a poor connection in the trunk actuator may be the case, if there is a way to release the trunk from the inside, climb in the trunk, open it and check the actuator for a loose connection.

Checked all the fuses? I assume your trunk has no key cylinder.
Can you fold down your rear seats? Many times there is a manual release inside the trunk, just incase you lock yourself in the trunk!
If there is no manual release lever or cable with handle to pull the latch itself may have a slot on it that when a flat screwdriver is inserted and twisted it will rotate the release.

i'm not 100% sure with that vehicle, but you might be able to remove the back seat to gain access to the trunk

my trunk release button dosent work i just bought the car and it dosent have a key for the trunk?

if the seloniod is ok on the trunk release and if you are mechanically inclined pull the trunk release button from the glovebox and jump between the two wires on the connector, that should open the trunk

make sure the switch in the glove box is turned on.

inside the trunk near the latch is a switch that kills the trunk remote

Use the trunk open button in the clove box.