Add the following code in between <head> and </head>
<meta http-equiv="refresh" content="0; url=directed address">
The content part is for how many seconds the visitor has to wait before the page is redirected. So if you have 3, then the visitor will have to wait 3 seconds. If you want straight redirection, leave the number as 0.
The url is the address you want your visitors to be redirected to.