Tip:
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First, go to the search box and type "Static Iframe Tab"
You will need to authorize the application by clicking "Allow". I have already allowed the app so it's not showing up. Once you are on this page, click "Install Page Tab"
Select the page where you want the tab to be installed
Click "Add Static Iframe Tab"
You will see the blue arrow icon titled "Welcome" on the left sidebar along with wall, info, photos etc. Click that tab.
This is where you will paste the link to the tab. For example: http://www.yoursite.com/fanpagefiles/inde.html
Put the height of the tab. Here it is 1500px. It should be changed according to the height of the the page.
Be sure to click the check box "Hide Scrollbars"
Click "Save Changes" and your tab will be installed!. For reveal tabs there are options on this page which you can configure by the same process of placing link, giving height etc.