How to change your profile picture/name a blog on tumblr?

Oh my god help me before I break something. My computer is broken so I'm stuck on mobile devices, (iPhones, iPad) all I have is an iPhone 5 and an iPad 1. I just got a tumblr and I want to change my profile picture and name a blog and I can't figure out how… I'm literally about to break something help me.

To change your Tumblr profile picture, Open your Tumblr blog. In the top right corner of the screen, click Customize. A drop down list with your current profile picture will appear. Click Browse next to the picture
Or
On your dashboard go click your blog name which is on top, once your on that page on the right click settings which is under Customize Appearance. In the first section it says Portrait Photo and a square next to where your photo will appear, click Choose File, choose a photo > open
Does this help?

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