Permalink/Slug Change or Edit

Hello...I'm setting up a new website using this theme, and with previous catch themes, I could modify the slug for a page therefore allowing me to change the permalink accordingly. I cannot seem to find this ability without the Sound Construction theme. How do I update/fix/edit not onl the slug...but correct the permalink. I would like the page URL to be identified by the page name... Example: https://saparts.com/?page_id=13 I'd like it to read: https://saparts.com/contact which is more proper....Please let me know. Thanks!! :)