Step1: Locate these sections:
For the Header: <b:section class='header' id='header' maxwidgets='0' showaddelement='no'>
For the Crosscol: <b:section class='crosscol' id='crosscol' showaddelement='no'>
Step2: Change the codes above into these:
For the Header: <b:section class='header' id='header' maxwidgets='5' showaddelement='yes'>
For the Crosscol: <b:section class='crosscol' id='crosscol' showaddelement='yes'>
Step3: Save the template and go back to the Page Elements tab. You will notice that new element boxes now appear. Now, you can add new widgets in these areas.