Add a hyperlink when you want to link to related or more detailed information from another page in a diagram, an online document, or a website.
Link to a web or email address
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Select the shape.
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Select Insert > Link.
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Type in an email address, a website address or an FTP address, and select OK.
Link to another page in the diagram
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Select the shape.
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Select Insert > Link.
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Select Browse.
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For Page, select the flowchart you want to link to and select OK.
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Type in a description, and select OK.
Note: To open the link, point to the shape and press Ctrl as you select it to open the link.
Link to a document
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Select the shape.
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Select Insert > Link.
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Select Browse > Local File.
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Go to the directory where the document is stored, select the file, and select Open.
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Type in a description of the document and select OK.
Edit a hyperlink
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Select the shape that contains the hyperlink you want to change.
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Select Insert > Link.
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Change the existing hyperlink, or select Delete to remove it.
Source: Microsoft