Took me a while to figure this out, and it was pretty obvious once I found it. And comically, I have a signature--I am such a hypocrite!!how do you block signatures its a back door way to introduce politics and shouldn't be allowed
1. Click your name in the upper right.
2. On the left, you will see a bold heading PREFERENCES
3. Under Settings, click the link for Preferences
4. In the middle of the page, you will see Content Options. Uncheck the 3rd box on the list "Show people's signatures with their messages."
Just in case you like my signature!
It ain't no sin to be glad you're alive. 😉