Could you please tell me how I can go job-hunting in the web?
Generally speaking, job seekers can enter the websites either of job agencies or of some units for job advertisements.
How should I contact them?
You can e-mail your application materials for application to the websites of job agencies for enrollment in their database.
Can I get a quick reply from the sites?
Yes, usually it takes a short time, but you have to await the choice of the units for a while.