How to make this thing in photoshop? (you can give me tutorial link)?

I want to make a red lable sicked on a photo. Like the one you chop on an envelope and write "top secret". YOu can give me the tutorial link. Here I got an example a href="http://www.google.com.hk/imglanding?q=pwned&um=1&hl=zh-TW&sa=N&tbm=isch&tbnid=ArGHMLOS4APXEM:&imgrefurl=http://swingstateofmind.com/%253Fp%253D783&imgurl=http://swingstateofmind.com/wp-content/uploads/2008/10/pwned1.jpg&ei=nCiJTe7rDMf0cPXG_MMM&zoom=1&w=468&h=339&iact=hc&oei=lCiJTbeaGoPZcZmF6aIM&page=2&tbnh=114&tbnw=152&start=66&ved=1t:429,r:4,s:66&biw=1920&bih=934" rel="nofollow"http://www.google.com.hk/imglanding?q=pw…/a