i m Jr member. how can i add my avarta?
You start by threading the whole thread... it was only 6 posts long! 
Then you realise when you get to Post #2 that they gave the answer (as did Posts #3, #4 and #5
):Yoy cant change your avatar until youre a full member
They also gave some great advice!
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its better you check through the site before asking these sorts of questions buddy, there are many threads on this already.
I'd recommend you start here:
https://bitcointalk.org/index.php?topic=1689727.0