having issues running npm install -g cylon-ble

[myingling0603]

Marks-MacBook-Air:node_modules ibmyingling$ npm install cylon
npm notice created a lockfile as package-lock.json. You should commit this file.

• [email protected]
  added 1 package in 5.895s
  Marks-MacBook-Air:node_modules ibmyingling$ npm install -g cylon-ble
  npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/cylon-ble
  npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules/cylon-ble/node_modules
  npm ERR! path /usr/local/lib/node_modules/cylon-ble
  npm ERR! code EACCES
  npm ERR! errno -13
  npm ERR! syscall access
  npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules/cylon-ble'
  npm ERR! { Error: EACCES: permission denied, access '/usr/local/lib/node_modules/cylon-ble'
  npm ERR! stack: 'Error: EACCES: permission denied, access '/usr/local/lib/node_modules/cylon-ble'',
  npm ERR! errno: -13,
  npm ERR! code: 'EACCES',
  npm ERR! syscall: 'access',
  npm ERR! path: '/usr/local/lib/node_modules/cylon-ble' }
  npm ERR!
  npm ERR! Please try running this command again as root/Administrator.

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/ibmyingling/.npm/_logs/2018-01-20T16_04_21_354Z-debug.log
Marks-MacBook-Air:node_modules ibmyingling$ pwd
/usr/local/lib/node_modules/npm/node_modules