If you want to add a trigger with the hash value alone, I think it tells you what to do...
I think the part "You might want to set a minimum file size of 100 MBs to screen out text dummies or a maximum of 2000 MBs if you want to exclude ISOs." is not necessary. Because a hash value defines completely a file already.
Put the "173166e1ec2431e6b171ffddda26ef65fd225546" string in the hash field, that's enough for the trigger. This is the hash value indeed.
The size limit doesn't really matters, maybe it can speed up the search, I don't really know.
Triggering a file can take minutes, hours, days, months, years, depending on how long ago the file was shared, and how many sources are available. The way Share cycles through nodes, looking for files corresponding to what you are looking for, may affect that time too.