How I can delete cookies from my mac?

Download Onyx. It's free. Just make sure you do a backup first. Do not delete/clean anything you are not sure of when you use this app.

Good luck.

Cookie is an excellent app which allows you to clear cookies in a controlled way and all it needs is two clicks per day or time period.

SweetP Productions - contact us or available on the Mac App store For £10.49

Just a note, I have no connection with Sweet P, just satisfactory usage.

In Safari>Preferences>Privacy:

In Firefox>Preferences>Privacy:

For other browsers, the same principal should apply.

Ciao.