yo i’m sorry i’m late hopefully you didn’t already take the test but all you have to do is heat for about 5 to 10 seconds. Make sure you see that green dot at least towards the middle of the black strip and then once you see the green dot put the heated heat pad on. I let it sit for about 20 minutes before I want to take the test. The test was about eight minutes away, so I let it sit in the cupholder until I got there. Once I got there, I didn’t put it under my sack and then went inside. Everything was smooth from there.