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Right into the terminal :) Press 1 then enter

hehe no dude , my wif key ?

Your WIF key is automatically generated for you :) Generally it's a good idea to have a different key for your miners. But if you want to use your own account/key manually you can view/edit the key by doing this command:
cd /var/EZSTEEM/steem/programs/steemd/witness_node_data_dir && sudo nano config.ini

Where is the key within the config file? Trying to change my account owner key.

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