i mistakenly deactivated my cell phone!! now in the screen is written: samsung.... what can i do???

I went to my samsung cell phone settings about security. When i confirmed that i give licence to my google account to control my android cell phone, my cell switched off and only a "samsung" is written in the screen, i cannot operate it now!!! i can close it but when i open it, it is the same "samsung" screen again...

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