How to change my picture on Tumblr?

I don't have a picture on Tumblr, and i wanted give myself a profile picture. I can't seem to figure out how to do it on the iPhone 4s? How do you?

And follow my Tumblr: lets-get-fun-sized.tumblr.com

Go to settings. The setting button looks like a lock nut or a spur gear, or a wheel. Click that then click your blog, it is placed below the 'apps'. Then upload your picture in the 'change your avatar' link, don't forget to save.

http://letscreate-a-story.tumblr.com/

You can't do it on the tumblr app.
http://inserthegoodefulstuffhere.tumblr.com/

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