How to change your profile pic on tumblr?

So I got a new tumblr and it asked me if I want to add a pic when I was making it and I put skip because it wouldn't let you get a pic from your photo album and now I want to add a pic and I don't know how and by the way I'm trying to change it on my iPhone

On your dashboard on the top right hand corner there are little widgets, click the one that looks like a wheel. Then click the last option on the left hand panel (should be your username). Once you have done that there's a little box on the top and a caption saying "change avatar" click that and choose your file! Xxx

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