You need to be able to generate a SSH key in order to be able to add it to the Control Panel.
Learn how to generate a SSH key using a terminal and how to store the public version of the key in the Control Panel thr ough this how-to video tutorial: Generating a SSH Key
In case you have any questions after watching this video, please feel free to post them below or reach out through the community Q and A section.
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Sukrity Wadhwa