I have created a fillable form, and it works when I re-open the document to test it.
However when I send it, the recipient is able to see the blue highlighted field where information can be typed, but is unable to type in the allocated areas.
When I open the document in Google chrome or Adobe it works, but not if it opens in Internet Explorer.
They need to install Adobe Reader and it needs to install the correct plugin for Reader. That usually happens automatically if memory serves. BTW, Google Chrome no longer allows the Reader plug-in and uses its own plug-in.