Obtain a USB to TTL cable.
Decide how to power the Pi when using the USB to TTL cable. Either 1) Use a mico USB power adapter and do not connect the red lead to the Pi or 2) Connect the red lead to Pin #2 of the GPIO port and do not use a micro USB power adapter. For clear instructions on which lead goes to which pin see these instructions on the Adafruit website, take extra care with this as getting it wrong may lead to permanent damage to the Pi.
Start a terminal & connect to the Pi:
sudo screen /dev/ttyUSB0 115200
For further details see the Adafruit website
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