Click on the Global Settings Icon in the builder.
The preheader- this will update the text for your campaign header.
Logo - Here you can update the Logo, add the Logo as Text, or remove the Logo completely from Campaign. You can also align the the Logo, add a Link to the Logo, and change spacing for the Logo.
Colors and Fonts will allow you to customize colors or use auto-branding colors that were set under your account settings for Heading 1, Heading 2, Heading 3, Normal Text, Header and Footer Text, Button Color, Button Text, Link Color, Canvas BG, and Email BG.