easiest way is to create your bungie.net account first on website.
from there, u can search for clans and request to join.

can also do from bungie app but still i suggest u create your account in website first

I would invite you into BT but we are already full. A quick check on the active clan list on the first page shows that WOAG [Wrath of Asean Guardian] still got slot. Maybe u can contact Astaroth6065 to join.  Kobis Empire is an option, you can contact syaigon for more info. Toah Lampah clan is one of the most unique around      [see their name lelz] you can contact fllee520 for more info.