We never start a sentence with 'How to', we only say 'How do you...?' Pls bear in mind that 'how to' is only used in the middle of a sentence, for example, 'Would you tell me how to include a reminder in an e-mail?' BTW, to begin a sentence with 'How to' is one of the most common mistakes Chinese people make, which are called 'Chinglish'.
英语里从不用“How to”作为句子的开头，而只说“How do you...？”“how to”只能出现在句子的中间部分，如：'Would you tell me how to include a reminder in an e-mail?'（能告诉我如何在邮件里添加提醒吗？）用“how to”作为句子的开头是中国人最常犯的错误之一，是典型的中式英语。
We should write: “How do you open the box?” “How can the box be opened?” etc.
On the other hand, during oral conversation face to face, we may say: Do you know how to open this box? Can anybody tell me how to open this box?
Under the oral conversation circumstance, we may omit the words in italic, i.e. how to open this box?
Forum is a place for people to communicate with written words, but in the style of conversation. Since the post may be considered as a form of “oral” conversation, starting a sentence with “How to” is acceptable.
Of course, when writing formal English, we should follow happyjyl’s advice.
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