How do you give sysop
Assuming you're on desktop, open the contributions page of whoever you want to give sysop, then click on the "user rights management" link on that page.
On the user rights page that open, click on the administrator option and then save the change.
I’m on mobile
You can go to the user rights page I mentioned with this link above, just change it accordingly.
In case you can't see the link above, just go to the
Special:UserRights/PUTUSER'SNAME page on your wiki
As an aside, make sure to keep your post titles more descriptive next time, so that one can see what's going on.
Make sure you're a bureaucrat and don't give them bureaucrat as well unless you really, really, really trust them.
What do you think?