To connect your Tradier account to Option Alpha, go to Settings --> Trading Accounts and select 'Authorize on Tradier.com.'
You will be re-directed to their website to log in using your Tradier username and password.
Once your accounts are connected you can select your Tradier account when creating a new bot to trade live.
You can authorize one set of credentials (username/password) per broker. You can connect multiple accounts with the same username.