This twig code will create a [Edit] link in user profile which will appear to the user only when he is viewing his own profile.Paste this code in a twig code element in user profile and set the price for editing nick=0 in the shop settings if you dont want to cut any pluses for changing nick.
{% if api.r.get('uid')==api.user_id %}
<a href="shop.php?act=nickch">[Edit]</a><br/>
{% endif %}
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<a href="shop.php?act=nickch">[Edit]</a><br/>
{% endif %}
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