To get a Signature or Avatar:

Look up top where it says "Profile"
Click that,
And you will see a series of tabs, One will say Avatar, just simply click that and browse for an avatar!
One will say signature, click that and type in a signature! ( A signature is what will go after each thing you post. )

:]] Yayy youu.
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To post pictures:

When leaving a post,
you will see a series of buttons.
One of the buttons, when you put your mouse over it says " Host an Image"
Click that,
and then browse your image.
It will show you three codes.
Copy & Paste the MIDDLE code into your post! :]
And Wallaa!