There's a couple of ways, one way is
- Get search results
- Do
SPC /and type in your search string - or
SPC x Sand search string - where x is your scope indicator (p for project, d for directory, etc..)
- Do
- Once you have the occurences you want, hit
C-c C-einside the helm buffer to put all your match occurences and puts them into a special buffer called the edit buffer or something like that - in that buffer you can use any commands you'd normally use on a buffer
- the
C-c C-cto commit your changes.