Go to your profile page.
From the navigation list click on avater.
Choose file from your pc or paste url of pic you want to save as your avater.
click on the save button.
Avater may be upto 100 px.
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Apne profile page te jao.
navigation list ch avatar te click karo.
choose file te click karo
apne pc ton koi image seleck karo.
save button te click karo..
avatar 100px ton jada na hove.