Basically it's simple...
http://www.vocaroo.com
All ya gotta do is go there and record a snippet of...well you talking(MAKE SURE WHEN YOU ARE DONE RECORDING YOU GET THE LINK TO SHARE IT (you will have to click a little button)...IT'S BELOW THE BUTTONS). It can be about whatever (keep it at least marginally appropriate).
EXAMPLE:
Spoiler:
NOTE: If you do not want to reveal your voice for whatever reason, that is OK. I'm not here to judge you for that and I'm sure no one will mind.
And for an extra challenge (if you're up to it), you should try singing something
PLSPLSPLS KEEP THE RICKROLLS TO A MINIMUM. I KNOW YOU ALL FANTASIZE ABOUT RICK ASTLEY BUT HOLY HELL...