Hi Dad, try editing this page by clicking the pencil symbol at the top right of your screen. Make your changes, and then click the blue "save" button at the top right.
The standard I am using for all the text on this site is Font Verdana, size 12. This can be set at the top left of the screen under the "Insert format table" etc. simply highlight all the text and then choose the font and size as appropriate.
Once you have deleted this text and added some of your own (Maybe even change the layout with the Layout menu at the top left of the screen?) try adding a new post with the new post button underneath this text area.
I have added a few google gadgets to this post just to show you what can be achieved - you can embed maps to show people where your talks and events are for example. You can easily delete these when you edit this page, just select everything and press delete or backspace.