To say "how to say something in English" in English, you can say "how to say X in English." The phrase "how to say" is used to ask for instructions on how to correctly pronounce or express a specific word or phrase. For example, you could say "How do you say 'thank you' in English?" and the person you are asking might respond with "You say 'thank you' in English." Here are some additional examples of this phrase in action:

"I'm not sure how to say this word in English. Can you help me?"

"My friend is learning English and asked me how to say 'hello' in English."

"I always forget how to say 'please' in English. Can you remind me?"

The phrase "how to say" is commonly used in English to ask for help with pronunciation or expression, and it is often used when someone is learning a new language or is unsure about the correct way to say something. It is a useful phrase to know and can be helpful in a variety of situations.