I cant select the field Drop down

The error alert is blokcing to select the field 

https://form.jotformz.com/71156780354660

There is a condition set up in your form to disable nearly all fields in the form if compras is selected:

This condition is what is causing the fields to be inaccessible.

No, the conditions are okay, the problem is the error in front of the select button

Please inject the following code to fix the problem: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes 

#cid_174 div {

  margin-top: 25px !important;

}

Result: