Problem

By default in SharePoint 2013 there is no option for "Sign in as different user".

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Use the following procedure to enable this in SharePoint 2013.

Solutions

Step 1

Go to the location:

C:\Program Files\Common Files\microsoft shared\Web ServerExtensions\15\TEMPLATE\CONTROLTEMPLATES

Here we have a file named "welcome.ascx".

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We need to edit this file to enable the option.

Step 2

Open the welcome.ascx file in Visual Studio or in Notepad and add the following code and save it:

<SharePoint:MenuItemTemplate runat="server" ID="ID_LoginAsDifferentUser"
 Text="<%$Resources:wss,personalactions_loginasdifferentuser%>"
 Description="<%$Resources:wss,personalactions_loginasdifferentuserdescription%>"
 MenuGroupId="100"
 Sequence="100"
 UseShortId="true"
 />

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And it should be above the tag that has ID_RequestAcess.

Step 3

Refresh the site and then "Sign in as different user" will be enabled.

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Summary

In this article I tried to explain how to enable the "Sign in as different user" option in SharePoint2013.