I told my iPhone to forget a network, now I need to access that Bluetooth network. How do I recover access?

Aha! Okay, for Bluetooth, do two things: first, turn Bluetooth off. ( settings > Bluetooth )

Second thing, be sure the earbuds are set in discoverable mode (that is, they are turned on, powered up, whatever)

Third thing, turn on Bluetooth on the phone. The phone will 'discover' the earbuds.

Bluetooth is a connection made directly from your iPhone to a device like earphones, speakers, home pods, etc.

You are probably thinking of your wifi network connection. You can rediscover the forgotten wifi network by turning wifi off, and then turning it back on again.

To turn your wifi off, tap settings, tap wifi, and turn the wifi switch off at the top of the page. Wait 30 seconds, and then turn the wifi back on. If you're in range of the wifi network, it should show up as an option.

If you meant Bluetooth, you just need to pair again to the device in question (check the instructions for the device if it is not clear how to do that).

If you referring to a Wi-fi connection, just connect to it again and reinput the password.

Even if you told your phone to forget a network won't stop that network from showing up in Wifi. Did you do as recommended by turning Wifi off in settings, then turning it on again? If the network exists, it should appear in the list of available networks. When you tap it, you'll have to reenter the password.

On a rare occasion, you might have to restart your phone to re-engage the wifi. If switching wifi off and back on does not work, simply hold he power button and slide on the screen to turn the phone off.

Then hit the power button to turn it back on. Once the phone restarts, the wifi network will be an option if you're within range of that network.

That makes much more sense. Find the owners guide for the earbuds. You'll have to put them in pairing mode and often that means resetting them back to factory settings to be discoverable again. If you can't find the user guide, go to the manufacturers website and find the user guide.