Good evening Tom and welcome back!
Thank you for reaching out to us.
I would love to help you with these questions.
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
1) How do I change the Color of the text of the header?
Without knowing much about your site, it’s a bit hard to answer.
However, chances are that if you go to Appearance > Customize , you will find a ” the Events Calendar” section that contains many color customization options.
2) how do I add a photo to the Photo View of the calendar
Normally, all you need to do is to use the built-in WordPress “Featured image” option.
If you do not see that option on your “Add event” page, you can add it using the following instructions

3) How do I make it so, it is ONLY the header or event on the Calendar and not the whole description.
Could you give me the URL or at least the view in which you are interested in doing this.
Best regards,
Geoff B.