HELP check engine light

So last night I was messing with the intake... I took off the mass air sensor.
When I was dine I closed the hood started the car and recede the motor. I then went inside. This noting I turned the car on and ran it fir 30 sec till I noticed the check engine light. I pulled over and turned the car off and plugged the sensor back in.
Now since then
I have turned the car off 2 times and have driven it for 45 min and the light us still on. How do I get it off! Pleaser help it makes me mad when i see it

Try resetting your ecu by disconnecting the battery. Make sure to have your maf reconnected before you re-connect the battery.

Light turned off when I got in the car right now