Is there are a way to change the 'From' fields while sending a fax, like name, address etc. from the FaxFinder client API's?

The API's "From" information is taken from the Client settings.

The "From" fields can only reflect whatever is currently entered on the Information tab under File ->Options in the FaxFinder Client software.

It is not possible to have the "From" information be different that what is configured in the Client software.