This is how to change the link color in WordPress. You don’t need to use a plugin and to make all your links one in color which means all the active ones in your website/blog.
You cannot use multiples colors for every post but the one you choose will be default one for your whole site. This method will not work on all the themes or it is added in the theme itself
FIRST, Go to your dashboard and choose the appearance option
SECOND, Choose to customize option under Appearance option after it expands
THIRD, In the customize page, you will have multiple options on your left side and click on the colors
LASTLY, Change the link color to your preferred one and click on the publish button which is at the top