To set up your email signature, you can find it on the Profile Settings-->Email settings-->General, or through the link here. You can locate the Email Signature section below the integration part.
For Business users, you can locate it on the Product Setting-->Email setting page.
You can go over the following steps to save your signature:
1. Edit or Copy the Content
Simply type in or copy your current email signature and paste it here. Use the toolbox above to modify the font and format of the text. You can even change the color of the text or add variables to it.
2. Insert Links
The original links in your signature will be copied automatically. If you need to add new links, select the text and then click on the link button in the toolbox. You can give it a title and choose if you want it to be opened in the current window or in a new window.
3. Add an Image/Logo of Your Organization
The logo and images in your signature will be copied. If you want to update the logo or add new images to the signature. Use the image button. You may provide the source information directly or upload an image from your computer.
You can then adjust the displayed size of the image.
When you finish, remember to click on Save to save/update your signature. You will find a notification in the upper right corner to confirm the changes.