There are both paid & unpaid method in promoting your services / products. Paid promotions is fairly simple & straight forward , all you need to do is use their ad platform found under the page "Advertising" , you can choose between CPM / CPC based on the nature of your business , target audience as well as your budget. Unpaid promotions is bit tricky & you need to invest some time & effort in-order to avoid getting banned Try to help others by providing suggestions / tips for their problems & in turn you will get Likes , which will help you to promote your services. Also you can include your promotional content in the signature of your profile , which will get added to your threads. Hope this helps