If you do not have the file already - create one in the root folder of the site called web.config
Edit this file and paste the following:
<?xml version="1.0" encoding="UTF-8"?> <configuration> <system.webServer> <rewrite> <rules> <rule name="WordPress Rule" stopProcessing="true"> <match url=".*" /> <conditions> <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" /> <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" /> </conditions> <action type="Rewrite" url="index.php" /> </rule> </rules> </rewrite> </system.webServer> </configuration>
Save and Retry.