Hi Annette!
The best way to change the color of your link text is to use the Text customization controls available in the Post and Page Builder Visual editor.
First, highlight the text that you want to change the color of in the Visual editor. Next, click the Text settings option that appears in the dynamic menu at the top of the editing screen to open up the Text Settings pop up window. In the pop up, click the Edit button in the Color controls and then choose which color you want to use for your link text.
I hope that the Text Setting controls help you get your link text displayed with the correct color and please let us know if you have any other questions for us!