How to change a tumblr avatar from an iPhone?

I've looked it up on google, did the step by step and everything but I'm still completely lost. Can anyone tell me how I go about doing it? I just. I just can't seem to figure it out. Djdftbfhhhxsgb why does technology have to be so confusing>.<

P.s. It's in this section because I like it here and I don't know where it's supposed to go. The suggestions weren't fitting and I'm pretty sure those sections are dead anyways!

I suspect no because you have to download a avatar from your computer.

In respect to "why does technology have to be so confusing" I would have to say:
Is it or are we becoming so conditioned to technology finding solutions for us that when its does not we can't just accept that not everything can be as we want it.

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