Assuming you would like to change the color of text in an Adobe Acrobat document, below are instructions on how to do so:
1. Open the Adobe Acrobat document that contains the text you want to change the color of.
2. Click Edit in the upper left-hand corner of the window.
3. Select Find & Replace from the drop-down menu that appears.
4. Type the word or phrase whose font color you want to change into the Find What text field, then click Highlight All to select every instance of that word or phrase in your document. If you only want to change the font color of a specific instance of a word or phrase, leave Highlight All unselected and use your mouse cursor to double-click on that particular instance instead.
5. Click on the down arrow next to the Change To text field, then select Format>Font Color from the drop-down menu that appears.
6. Choose your desired font color from those listed, then click OK.
7. Finally, click on Change All > OK in order to implement these changes throughout your document accordingly.