Hi there! You'll have to go to the group's tab and select "create group." You'll be given some E-paperwork to fill out then. After you've successfully created a group, you'll need to make it into a clan, which a button would appear to do that I believe. Then you'll have to fill a few things out again.
This link give a little more of an in depth description of clan creation.
https://www.bungie.net/en/Help/Article/12273
Also just the general clan/group FAQ.
https://www.bungie.net/en/Help/Article/12612
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Thanks for the help. We appreciate it!