Search keywords

Design help CMS
1

Can I add a textfield let visitors search some keywords of my post ?

how to do this ?

thanks.

Here is my public share link: LINK
(how to access public share link)

2

Searching within the same page? Yes, it is possible using custom code.

3

I want to search all post in my blog.
just like other blogs.
can I do this ?

4