This tutorial assumes you've already logged in to RoundCube webmail
Now let's learn how to use multiple identities
1) Click the Personal Settings link here

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2) Then click the Identities tab

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3) To create a new identity, click the New identity button here

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4) Enter the desired information for the new identity

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5) When finished, click Save
 
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The new identity is now listed along with our original identity

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You can create as many identities as you wish, by repeating the steps we just did
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6) Let's return to the main E-Mail page

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7) Click here to compose a new message

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8) Now when sending email, we can choose to send FROM any of our identities by selecting the identity from this Sender drop-down box

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This is the end of the tutorial. You now know how to use multiple identities in RoundCube