Edit the menu
From any web page
From the admin area
Add a Custom Link
1. Click the arrow next to custom links to open it
2. For the URL put in https://www.yourRealdomain.com/gallery
3. For link text put in the text you want to show on the menu for example Photo Gallery
Click add to menu and it'll be added to the menu on the right side of the screen. Drag and drop it as needed to place it where you want it on the menu. Save the menu and it's done.
Add your logo in the admin