Click on the Settings icon in Gmail.
Open your Gmail - https://mail.google.com/ and you'll find the Settings icon at the top right, as shown in the screenshot.

Click on the "See all settings" button.
As shown in the screenshot below

Scroll down to the Signature section and set your signature.
As shown in the screenshot below

Click on the "Save Changes" button to save your signature.
You'll find the Save Changes button at the bottom of the settings page, as shown in the screenshot below.

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