DL is introducing us here to the way Spanish commonly uses the passive voice construction, as has been noted here in the discussion. Literally, the sentence is "How is this word written?" // ¿Cómo se deletrea esta palabra? "How is this word spelled?" When translated into English, we often remake the sentence in the active voice, hence "How do you write this word?" but in Spanish it is a passive voice construction. Incredibly common.
In Spanish, the translation of "How do you write this word?", is: "¿Cómo escribes esta palabra?" Where is "tú" in the first Spanish sentence. Who the question is for? The subject is indefinite. Besides, "Se escribe" = "It is written" and "¿Se escribe?" = "Is it written?"; then, "How is it written this word?" or "How this word is written? The meaning of the sentence of Dúo's answer is not the same.
The literal translation of the Spanish sentence is "How is this word written?" Remember that you need the word order "question word - conjugated verb - subject - full verb" in English.
Duo's English sentence is using the "impersonal you". It is not asking about how you, personally, write that word, but how "you", the general population, writes that word.
"If there is a crime happening, you have to call the police." Not only you, but everyone needs to do this.
The meaning of the question is slightly different. In English, we say "how do you write this word" but we are using the word "you" as the general you. It is more correct to say how does one write this word. If you use "te escribes" you are asking how one specific person writes a word, not how the word in general should be written. I hope that makes sense.
The "you" of the English sentence is an impersonal "you". That means it's not about how you, specifically, write the word, but how the general public writes it; how the word is written. Spanish uses a passive form here, which includes the pronoun se.
- Esta palabra se escribe así. - This word is written like this.
- (Esta palabra te escribe así. - This word is writing you like this.)
You're probably mixing it up with the accented sé, which is the present yo form of the verb saber, meaning "I know".
Se (without an accent) is commonly a 3rd-person reflexive pronoun, so it means something like "himself, herself, themselves", and a few more things. Se is also used in passive constructions like in the sentence above. Literally "¿Cómo se escribe esta palabra?" would mean "How does this word write itself?", but it's better represented in English as "How is this word written?"
They are using the "Impersonal 'Se'".
"Se" is the generic pronoun.
It has many uses.
This one is to make "Impersonal" statements.
"¿Cómo se dice?" is the classic version.
It can be translated several different ways:
1-"How does one say?"
2-"How is it said?"
3-"How do you say?" (The "You" is not any specific person but the general "you")
An utterly nonsensical sentence! The speaker does not SAY the word. How does the one being asked know which word? It can only be that the questioner points at a place where it is written, printed, etc. In that case he doesn't need to ask how to write it.
Rules for examiners: Engage brain before posting questions.