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.
Scroll down to the Signature section and click on 'Create New'

Customize your signature name in Gmail settings.
As shown below.

Save changes in Gmail settings after clicking on the 'Done'
Congrats, you've created your signature in Gmail.

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