When applying a link to text it is standard HTML for it to change blue, this is not something we can prevent.
When trying to change it back to the colour you would like it to be, you can either highlight the link and select the colour from the foreground colour selection box (at the top of the editor) or you can change it in the HTML code as instructed below:
Link has turned blue
Changing it in the HTML code is fairly straight forward even if you are not a HTML designer.
Switching to HTML view
Click on the HTML button at the bottom of the editor to switch from design view to viewing the HTML code.
Finding your Link
1. Using CTRL+F find your link text, (in this example it is Visit our Website) within the HTML code.
The HTML code for your link will look something like this:
<A href="{Content/CampaignURL}/lz.aspx?p1={Content/EMailLink}{Content/CampaignCode}&w=53&cID=0&cValue=1">Visit our website</A>
2. You would then have to put the font tag inside the link so it would look like this:
<A href="{Content/CampaignURL}/lz.aspx?p1={Content/EMailLink}{Content/CampaignCode}&w=53&cID=0&cValue=1"><FONT color=#ffffff>Visit our website</FONT></A>
With the opening font tag <font color=#ffffff> going just in front of your link text and the closing font tag </font> going just after.
Edited Link
Your edited link will look something like this.
Switch back to design view
Switch back to design view to check you are happy with the colour of your link.
Please Note: You can remove any colour by using the breadcrumb string.