Issues with a PDF Form

[Agirona]

I have a few concerns regarding the attached image.  I created a form in LC ES2 and saved as a PDF.

1. When I click in the "Hours" and "Notes" column, it displays a drop-down list box. I would like to eliminate the drop-down list box from both columns.
2. I set the fields in this column as a decimal.  However, it will not allow me to type $150.00 in it but will allow me to type other currency.  How can I fix this issue?
3. Once I save the document into a PDF form.  I would like to protect or keep a user from changing the numbers in the "Hours" and "Rate" column.  How can do this? 

Please provide some suggestions, and thanks in advance.