Follow these steps:

1. Visit https://tplinkwifi.net or  https://192.168.88.1

2. Go to Wireless > Wireless Setting, and change your SSID and password. After that, click Save. 

Note: To update your 2.4GHz or 5GHz network name, you’ll need to disable bandsteering first before clicking on the 2.4Ghz and 5Ghz tabs to modify the necessary settings. Make sure the names are different to successfully make an update.