title: adb command not found when trying to use adb to install apk file
body: <p>I'm trying to install an apk file in my emulator. I navigated to the directory where the apk file is and typed adb install [name of file].apk  </p>
  
  <p>I received this response:</p>
  
  <pre><code>-bash: adb: command not found
  </code></pre>
  
  <p>What should I do? Please keep it simple as I don't know much about this.</p>