In the example image I made the telephone number clickable by adding a special kind of hyperlink.
![how to set up signature outlook mac app how to set up signature outlook mac app](https://helpdeskgeek.com/wp-content/pictures/2020/02/add-signature-outlook.png)
To change the color of any text in your signature, all you need to do is select it with you cursor and click the Color dropdown menu > then pick your color, or click More colors (at the bottom of the panel) to choose a custom color.
![how to set up signature outlook mac app how to set up signature outlook mac app](https://www.codetwo.com/media/images/esig365-signatures-add-in-outlook-ribbon-v3.png)
You can edit your Outlook signature to make it look more organized and give it a clear visual hierarchy, by setting different colors and font sizes for the most important information.