Detailed way? Go look up Benjamin Franklin's last behest, also referred to as "Benjamin Franklin's Strange Behest." Library, encyclopedia, internet, they all have plenty on the subject because of all the litigation and profound effect of using a pebble to create a mountain.
The faster way is to simply pay a few moments' attention.
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Franklin left the equivalent of 900 of today's dollars to be saved and grown. The 900 was not to be touched, but some or most of the interest on the money could be used to help less fortunate people. Whereas Franklin allowed the interest to be touched while not molesting the principal sum that capitalized the account, the sweet twist we put on this PowerGem from Mr-Shortcut is that neither interest nor principal is to be touched for the full term, assuring that the hundred will double at least twenty-something times, perhaps even 28 or more times. The growth is exponential, and will feed literally billions of people.
For those who count the thousands of children who benefited from Mr. Franklin's largesse all during the two hundred years of its growth Invest one hundred dollars and put it into any long-term investment such as a bank account or savings bond or insurance policy, with instructions that it not be touched for 200 years, then should be used to feed the hungriest people on earth. That's it.
If you wish to follow Franklin's wise advice about putting all of our eggs into one basket, do it next year with a different investment vehicle, maybe a single share of super-blue-chip stock. Two and three years ago, put another hundred dollars each year into yet other savings vehicles, all to be left untouched.