Step 1:Log into your Drupal 8 admin interface.
Step 2: From the top menu select the Menu option.
Step 3: A secondary menu will appear just under the first. From here, click on the Structure option.
Step 4: From the Structure list, click on the Menu option.
Step 5: You will see the memu listing page. From here, locare the menu you want to work with and select the Edit Menu link from the dropdown on the right side of the row.
Step 6: We are now in the link list for the selected menu. There are two ways to change the order of the links.