It's likely that your RedNote app's UI language will be automatically set to English to match your phone's language. But if you find that your RedNote’s menus and navigation are still in Chinese, follow these steps:
Open RedNote and tap on the profile icon (bottom-right).
In your profile view, look for the gear icon.
Select General Settings.
Tap on Languages (多语言 / duōyǔyán).
Select English from the list of available languages.
Restart RedNote for the changes to take effect (if needed).