Resetting (or 'Trashing') the Lightroom Preferences file

Hi,
in an effort to make the edit-in option in LR work, I found instructions that I need to reset the preference file for LR. I followed the following directions, see below.
However, even with holding the option key down on my iMac, as directed, I cannot find the folder and file. I do not have a Library folder under my username, but only one under hard drive, and in there I can find com.adobe.photoshop files, but no LR file. Can anybody help me?
Lightroom Help /  
Preference and other file locations in Lightroom 5
Adobe Community Help
Products Affected
Lightroom 5
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What's covered
Important information for all platforms
File locations in Mac OS X
File locations in Windows 7 and 8
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Important information for all platforms
The files and file locations given here are defaults. Some of these locations can be customized in the Lightroom \Preferences or Catalog Settings dialog boxes.
While troubleshooting, when possible, rename files instead of deleting them.
If possible, back up catalogs on a different hard disk or volume from the disk where your catalog is located. For more information on backing up in Lightroom, read Back up a catalog in Lightroom Help and watch Backing up your catalog on Adobe TV. (The video was produced for Lightroom 4 but still applies to Lightroom 5.)
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File locations in Mac OS X
Note:
The user Library file is hidden by default on Mac OS X 10.7 and later. For temporary access to the user Library file, press Option and choose Go > Library in the Finder.
The Lightroom application file
/Applications/Adobe Photoshop Lightroom 5.app
Preferences
/Users/[user name]/Library/Preferences/com.adobe.Lightroom5.plist
Catalog
/Users/[user name]/Pictures/Lightroom/Lightroom 5 Catalog.lrcat
Preview cache
/Users/[user name]/Pictures/Lightroom/Lightroom 5 Catalog Previews.lrdata
Smart Preview cache
/Users/[user name]/Pictures/Lightroom/Lightroom 5 Catalog Smart Previews.lrdata
Catalog lock file
/Users/[user name]/Pictures/Lightroom/Lightroom 5 Catalog.lrcat.lock
Note: The lock file prevents the catalog from being overwritten when in use.
Catalog journal file
/Users/[user name]/Pictures/Lightroom/Lightroom 5 Catalog.lrcat-journal
Note: Open catalogs use the journal file to check for incomplete database records. Do not delete the journal file unless you're deleting its associated catalog, as well.
Catalog backup
/Users/[user name]/Pictures/Lightroom/Backups/[date and time of backup]/Lightroom 5 Catalog.lrcat
Presets and templates
/Users/[user name]/Library/Application Support/Adobe/Lightroom/[preset or template folder]/[preset or template filename.lrtemplate]
Serial number
/Users/[user name]/Library/Application Support/Adobe/Lightroom/Lightroom 5.0 Registration

Try making hidden folders and files visible temporarily following the steps described here Quickly Show/Hide Hidden Files on Mac OS X Mavericks & Yosemite | Ian Lunn - Front End Developer, it applies to Mavericks but I think is also valid for Yosemite (but not 100% sure). Please don't use a external drive when hidden folders and files are visible as there might be a bug with LR5.7.1 on Yosemite when they are visible (not fully sure).
When you are done with the preferences, make hidden folders and files invisible again.

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