Hi Jessica,
Any link by default will change to a blue that is shown in your image after being clicked, however you can colour the style of the link in the WISYWIG Editor for the Token, but that is if you have used a rich text token and not a basic text one. For the coding needed it would look something like this: text-decoration: none; color: #fff; this would be placed in the section called "ADVANCED" in the link section. I've added an image below for you to reference. The alternative method is to add this to the token if editable within the landing page or the XHTML used for the Landing Page.
Hope this helps you out!