!bangs in Brave search can be used directly on the search.brave.com website, as well as in the address bar when Brave search is set as your default search engine. An example of proper !bang format:
!d - DuckDuckGo
!s/!sp/!startpage - Startpage
!w/!wiki/!wikipedia - Wikipedia
!gh/!git - Github
!a - Amazon
!imd/!imdb - IMDB
!mw - Merriam-Webster
!camd - Cambridge Dictionary
!t/!thes - Thesaurus
!arch/!aw - Arch Linux Wiki
!wt - Wiktionary
!up - Ubuntu Packages