Don't worry about having to type your email signature over and over again on each email. Follow the steps below to customize your email signature:

1. Click on the profile icon on the top right corner of your screen and select Email Settings:
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2. Click on the Email Signature and create your signature. You can also format your signature and make it "jazzy" if you want to:

3. Further you can also use a pre-made email signature by clicking on the "Source" button in the top left corner and then adding the code to the body.

4. Once you're happy with your edits, click on the Save Button!

Here's a short video to help you do this:
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Hope this helped!