Never worked with uGUI before and looking for something to get started?
First, check Naninovel's UI customization guide (namely, videos and example project): https://naninovel.com/guide/user-interf ... tomization
Then continue with other non Naninovel-specific tutorials on Unity's GUI system. You can find plenty created by the community (check YouTube!) or pick an official course from the Unity's learning portal: https://unity.com/learn
If you'll stumble upon a Naninovel-specific issue, feel free to ask other users here or contact me on discord: https://naninovel.com/support/#developer-support