needing help with search form

Hi,

I have a wordpress website and I’m having trouble with inserting a search form… Can someone give me ideas?

It’s suppose to look like the search form on this site (https://www.maharaniweddings.com/platinum_guide/) with the same functions but it’s not working on my site… can you suggest a plugin or help me with this code? I want it to go to pages then sub pages.

[ Code moderated. For more than 10 lines of code please use pastebin.com instead. ]

Thanks for any help I can get this fixed.