what must I do to change my profile pictures and how must I do this
Click at the top of the page, "You" to bring up your profile.(alternately goto https://www.instructables.com/you )Under your current (non-existent) avatar click 'Change Image(s)'Upload a picture from your computer to your library and bam, profile picture!
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*attached picture has OLD instructables uber-orange layout...same procedure though.
Very simple. Log in --- then at the top of the page to the right there should be a thing that says "you" with your current picture showing. Click that. That takes you to your page. You will see a line of tabs in red/orange. The first one, which is usually where you are says "you" . Several tabs to the right of that is one that says "settings". Click the settings tab. Now you have more tabs under the big tabs. Starting at the left, they say, Profile, Customize, and then Profile Images. Click on that tab. This is where you can import pictures and change your profile picture. Just follow the directions on the page.
Click on "You" on the top right of the site to open your profile page.Then look to the bottom left for "Edit Profile" - and click on that.On the page that loads, you'll see next to your current profile picture, an option to "change image". Click on that link and follow the remaining links to "upload" an image. It's best if you use something square.