Hi,
1. Edit the site header element, switch to mobile view, and select the logo image, you can replace it with your own logo:
https://app.screencast.com/QLydxIMdwmsfs
2. Click the hamburger icon in mobile view, which opens the mobile menu, click on the button, and you can edit its link:https://app.screencast.com/Gvac41PwO0oc5