Open two tabs. In one open the post for editing. In the other go here > Appearance > Widgets and drag a text widget out of the Ab=vailable widgets box. Drop it into the sidebar box and click the right hand corner to open it.
Now go back to the post opened for editing in the first tab and swtich to the HTML editor. Copy all the code there for the Flag Counter.
Return to the text widget and paste in the code. Click “Save” and then click “Close” on the widget. View the front of your blog and see if the Flag Counter is there in the sidebar. It should be and if it is then all you have to do is send the post to the trash. Done :)