There are no form fields in that PDF. There might have been in the Word document it was created from, but those didn't make it through the PDF creation process. It's a good example of the sort of stuff too many companies make available for download. Since it has to be signed anyway, it will have to be printed first. You could
- pay out lots of money for Acrobat;
- go back to where you got it from and see if the original Word doc is available;
- copy all the text into a new Word doc, replace the underlined bits with spaces and then print it and sign it;
- print it as is, white out the underlined bits, photocopy the result and sign that;
- suggest to whoever produced this that they find out about how to prepare forms for download, fillable PDFs and digital signatures.
Noel