While in range of the wi-fi network you want to forget, you can do so right on your iPhone.
1. Launch the Settings app.
2. Tap Wi-Fi.
3. Tap the info button next to the Wi-Fi network you want to forget (royalelect.com or Royal Electric). It looks like a lower-case I.
4. Tap Forget This Network.
5. Tap Forget when prompted to confirm you want to forget the network.
6. Tap Settings, make sure Wi-Fi is green, and select Royal Electric or royalelect.com to connect to the wireless network.
7. You have completed the forget and reinstall of this wireless network.