Hi Hito,
I am using Google Translate so I apologize if my answer is not ideal. It looks like your group has not become a clan because there is only one clanmate in your clan.
We have a few articles that may help you with your clan:
Clan FAQ http://www.bungie.net/en/Help/Article/12273
Not seeing clan features http://www.bungie.net/en/Help/Article/12216
Joining a clan http://www.bungie.net/en/Help/Article/12212
Deleting a clan http://www.bungie.net/en/Help/Article/12370
English
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you did great, thank you so much Please forgive my ignorance about that fact you are talking about. i haven’t noticed that my group needs a certain members to become a clan, at least before i ask help in the forum. I really appreciate your time and help. Please sorry about my English :)