Search Bar on Top of Every Page

Hi –

You can easily add a search widget to the site. This is the easiest option and it won’t break your theme as updates happen.

Each theme has predetermined spaces for widgets. Consult the theme instructions for those details. https://wordpress.com/theme/rebalance

Creating a search bar from scratch and adding it to the site is beyond what we can support here. There are some guides out there that you can certainly try. Something like this.