Go to:
Settings > Reading
There you’ll see Postpage with a little pull-down menu.
On that pull-down menu you’ll have to choose the page where you want your posts to be on (Your blog).
After that it all should work.
About the font size of your header.
Go in your Admin Dashboard to : Appearance > Editor > Blue.css
And add the folowing code to line 12
font-size: 50px;
It will look like this:
li.current_page_item a {
color: #348CB3;
font-size: 50px;
}
If you really can’t figure it out, I could use Teamview to help you out.
Greetings,
Adil