Hi, Barbara --
I'm afraid we don't have functionality available to attach voice files to profiles, private messages or G2G posts.
Can you give us more info on what you're wanting to accomplish? Maybe we can help you find another solution,
The members of our Accessibility Angels Project might also be able to make some suggestions. I'm going to edit your question to add a tag that will get their attention.
I also strongly recommend Dasher (https://www.bltt.org/software/dasher/index.htm) as a keyboard. All you need is a mouse and a little practice to start flying through the words.
It was originally designed for eye tracking, but it works great with just a mouse (or your finger on a mouse pad on a laptop).
You could even use it with tilt functionality on your mobile device, although I find that a bit trickier.