You can set the colours of links in one of two ways. The easiest is to select the page icon and look at the page inspector:

To set the colours, drag a colour chip across from the colour palette, or click in the coloured box next to 'Active' etc. with the Control key down (probably right-click on Windows) to get a palette to choose from.

You may have noticed you don't get a choice for 'hover' - which doesn't work in earlier browsers anyway - and all the links on the page will be the same colour.

Here's the palette you see if you control-click:

To get more control, including different colours on different parts of the page, you need to use cascading style sheets (css).

You can go here to get detailed instructions for different coloured links on the same page, or if css is new to you, start with the css tutorial on this site, here

Please, please don't ever ....