Hello,
Provide us with temporary wp-admin and FTP access, and do a full backup before this.
wp-admin access: Create an account via Dashboard (Users > Add new) with administrator role http://prntscr.com/s3rc9m > provide us with username and password via the Private Content area http://prntscr.com/s5mao7 You can use any email for it.
ftp access: If you do not know how to create FTP contact with your hosting provider, they will help you.
Regards