Can I change the colour of a link, without changing the links in my menu?

Hello Michelle !
To change the color of a link in the DW Timeline, you can do as the following:
1. Install the Jetpack by WordPress.com plugin.
2. Set up Jetpack then enable the Custom CSS feature.
3. Navigate Appearance > Editor Css, add the following code:

    a {
    color: #...;
}

a:hover, a:focus {
    color: #....;
}

.hentry .entry-meta a {
    color: #...;;
}

.hentry .entry-meta a:hover {
    color: #...;
}

Hope this helps !