Here’s an interactive tutorial
** Best experienced in Full Screen (click the icon in the top right corner before you begin) **
https://www.iorad.com/player/2289531/How-To-Update-An-Existing-Page-Title-Or-Slug—WordPress–EN-0011-
9 STEPS
1. The first step is to open Dashboard and click All Pages
2. Click Edit below your page
3. With your mouse, select text in Add title
4. Type your new title. In our case that is “Homepage”
5. Click Edit
6. Delete the existing slug
7. Type your new URL Slug. In our case, it is “homepage”.
8. Click OK
9. Click Update