Where can I change the link color for the single post entries?

To change the link color in the single post of DW Argo, below is our instruction:
Firstly, follow the jetpack’s guideline in the Blog article on how to use Edit CSS here. http://cmspioneer.com/designwall/blog/using-jetpack-custom-css-for-your-wordpress-site/
Then add the code to the Edit Css.

.single-post .entry-content a:hover {
    color: #00A53C;
}

.single-post .entry-content a {
    color: #000;
}