I burnt my arduino uno, what should i do?

Today as i was trying to make a bluetooth rc i put the battery in the wrong pins and the board just generated smoke and burned out, should i use it as normal or is it useless?
I plugged it into my pc and it worked but i didnt try the pins.

You have let out the magic smoke and will be lucky if it works. What happens when you try ?

Did you have anything else connected to the Uno at the time ?

i had my bluetooth module and dc motor plugged in and it really does seem like working

If is working then continue to use it but not for anything critical