AirPods won't connect

my airpods (2nd generation) wont connect to my phone, i try to restart them and the light just stays white (doesn't flash). and when i open the case it just flashes green. When i first got them, only 1 was working, so i searched how to get the other to work and someone said to click 'forget this device' so i did and ever since, they wont connect. help.

[Re-Titled by Moderator]