Tweng,
Email your CV and a quick description of what you’re looking for to the “Email contact” as given on the website. They are usually eager to hire new consultants.
This email contact is usually Human Resources. So no need to be to technical in your quick description. Simply orientate him/her to your area of expertise, and your mobility.
Daily rate = the money you receive everyday.
For instance : you stay 30 days in a country, you receive 30 x daily rate.
For experienced RNO engineer, expatriated + consultant, expect 150 to 400 USD / day.