Step #1: Click the "Accounts" tab on the left hand side, then click the account name (i.e. people by default) on the main section of the web UI.

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Step #2: Click "View Users" on the right hand side of the web UI.

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Step #3: Click the username you want to edit.  Because of the permission level you're granted with Sidescale.com you will only be able to generate API keys for yourself.

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Step #4: Click the "Generate Keys" button.

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Your keys will be generated and appear midway down the main section of the web UI.