Hi @InternetMarketingAd ,

Thanks for posting your question to the Community! 

There should be options within the signup form builder to change color of text within specific blocks! 

Also if you copy and paste the text from anywhere, you'll want to make sure to remove any formatting that may be getting carried over: 

This way, you can readjust and reformat blocks to your liking afterwards. 

In regard to your question about editing source code, there currently is no option to do so in our signup form builder. However, source code editing is still available within text blocks used in email messages. Additional documentation all about sign up forms can be found here!

Hope you have a great day and thanks again for being a part of the Community,

Alex