@omer1789 It is a bit of a mess.
To get the patch working, go into the Resources/doc folder and you should see a folder 3.audio.examples (with any luck).
Open that and find "reverb-echo.pd" and copy that file into the folder that contains your patch "reverb.pd"
Then it will certainly work, and hopefully a Mac owner will post a proper solution.
Looking at your tree structure I would guess that [declare -stdpath ../doc/3.audio.examples] might work (dot dot slash doc slash) but apparently that might not b the mac way of doing things.
The stdpatth is "extra" or "bin" (bin is where the Pd app actually lies) so dot dot is up one level and /doc.3.audio.examples should make Pd search for that file.