Hi Steve!
You can update your profile picture in the Land F/X Portal.
You should file an 'edit profile' link under your photo on the left side of the Portal.

And how do I change the "About ME" section?

That’s a great question! We haven’t implemented that in a while. I think your ‘about me’ section is a leftover from some time ago. I’ll look into it.

I like leftovers. That's a good snippet. I also want to change my name from Seaweed to Steve Cook.

Well you can change your username in the Portal!