There is currently no ability to choose a hyperlink font color when creating an email in RENXT Email Designer. While the standard blue color is fine if your background is white, other background colors make the link hard to identify. Additionally, there is also no ability to match colors with your organization's brand.
But you can't change the colour of links in the email footer!
You can change the text color of the link by selecting the text that is linked and changing the text color using the standard text color dialog. See below.