"Kia Optima" key fob not working?!

"Kia Optima" key fob not working?!
So I couldn't start my car up the other day so I was going crazy because I had to go to work and I was close to being late so I'm running back in and forth in and out the house but I kept seeing insert the key but I was like when can I put the key at so I open the the glove box and seen a place to put the key at