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how do I join a community. I don't see the option

Go to this post and resteem.
https://steemit.com/steemit/@thehomesteadlife/3jrv2r-join-a-community-on-steemit

A post only lasts 6 days and then it is dead and can not be resteemed. That link is new.
Once you resteem the post you will be a member and i will put you on the members list. Be sure to use THL on your posts tags, not the first tag.
Cheers
THL