Looking nice and clean bud
Is the pic on your phone ? Do you use your phone to come on to NESF ?
If so click on the profile tab just under the main NESF banner. This will open a new page with some more options you need to then click on avatar to open a new page.
Now you will see a box that says choose file click it that will go to your pics stored on your phone to choose from. When you have picked the pic you wish to use it will take you back to the previous page go down to the bottom and click save.
That's how I do it anyway