when you click on the pen with the little dots coming out of it, you go up in to the bar below the bar with "file/edit/image...etc" and right there you'll see the pen options, switch it to the one with the box around it, after that click on the "T" or text button and hover over the line and it will change to a line with a curve on the bottom and top of it, click then type --------- I can rep now +rep for you, I always ALWAYS wondered how to do this
whenever i try this my text comes out looking cruddy, sort of jagged like i rotated it manually....any suggestions?