If your logo is not displayed on the front end of your website, go to Appearance → Mediavine Trellis → Display and scroll down to add your logo to the Site Logo field.
Click Save in the upper right corner of the Mediavine Trellis settings, then open a new post on your site to ensure that the logo is now displayed.
If the logo is not displayed, clear the Page CSS from Manage Trellis JS/CSS options in the admin bar, and clear any other caching plugins you might be using.
If the logo appears too big or too small, you can adjust the Mediavine Trellis Display settings to Change Logo Height.
The logo height default will be 75px, but you have the following options to choose from:
Small = 50px
Medium = 75px
Large = 100px
Extra Large = 150px
The width of the logo will be set to auto adjust to your logo height selection.
If a logo is not added to the theme, the site name will display instead.