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Click the third "Insert" button on the menu bar above, and the "Title" icon will appear in the middle of the next line.

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Click "Header" and a variety of "Header" styles will appear, as shown below.

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Select the "header" style you want, and a text box will appear in the header of the document. Enter the text to be added to the header. For example, enter "Baidu Experience"

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Click "Close Header" in the upper right corner of the page to complete the header addition.

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Or double-click in the blank space of the document body.

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