Hi Alison,
You have the ability to edit text options in the theme overall, in sections, or in widgets individually. In your case, you will want to click into the header you want to update > select edit header and footer > hover over the text you want to edit and click into the area. The text widget settings will now appear on the right hand side panel, where now you can select Customize > Text > make edits. You may find the following article to be helpful: Event Website Styling 101
------------------------------
Madeline Mason [Designation]
Customer Success Manager
Cvent
------------------------------