Hi there! It can take up to 1 week to see the Community tab after passing 1k subs. Community posts may also be available to other channels as we continue testing this feature with new audiences. For now, the best way to get access is to hit 1K subscribers.
To clarify, we are rolling out the Community tab to all users. Note that custom channel layout must be enabled for the Community tab to be visible. You can change these settings from your computer by following the steps given here: https://goo.gl/mE3Geu . Hope this helps.