Follow the link

http://www.qatarliving.com/classifieds/post

Select the section: Vehicles, Mobile Phones, Housing, for Sale / Wanted, Services, Jobs

fill out the information, preview, if ok then submit and you are set.

Just above all please read the Classifieds Rules

http://www.qatarliving.com/guidelines/classifieds

and stick to them.

Regards!!