Step 1: Navigate to Dashboard > Menus section of your admin.
Step 2: Click the “Create A New Menu” link to make a new menu. Enter the name then hit the “Create Menu” button.
Step 3: To add a menu item, select one of your created pages on the left-hand side and click “Add to Menu”. You can also add all kinds of different posts from the left side.
Step 4: To add a custom menu item, enter a custom name and link into the “Links” box.
Step 5: Manage your menus by using the drag and drop functionality. To create a dropdown menu, simply drag a menu item below and slightly to the right of another menu item and it will lock into place and create a dropdown section.
Step 6: After setting up your menu, scroll down to the bottom of the page to assign Primary Navigation.
Step 7: Once it's all done, make sure you click the “Save” button.
Add link for Multi-language of Menu:
Navigate to other languages then add the code of language to link, see the image below: