All makes sense except for this part, and maybe I’ve just had too many sleepless nights lately:
“From there you’ll want to hook into the wivm_search_and_replace_text filter and replace the variable with the notes. You’ll likely also need to use the wivm_after_opp_rsvp filter to save the notes when someone signs up, but may be able to handle that a few different ways.”
Explain how to ‘hook into’ said filters? Thanks much!