In the Edit page of the hub, open the text capsule. When the text capsule is opened, you will see the HTML button (link) in its toolbar. Click this HTML button and the HTML editor page will appear shortly (usually as a separate web page). In this editor page you can paste your HTML code, but not all HTML elements are allowed. The table element for example is not allowed here. If you want to have an HTML table in your hub, there is a separate capsule for that.
I will be submitting a series of HTML5 tutorials next week. In order to read the series next week, just type HTML5 and my name Chrys in a hubpage Search Box and click Search.