On the page that opens when you click the Add Product/Request button, the first step isto select a category. With the "Select Category" button, determine whether your advertisement is a Demand or a Product. Then select the sector related to your advertisement in the sub-categories opened. Use a word generalizing your post in the title.
For example,a company that sells food products shall Select Food Industry sector in the subcategory.
In the titlepart, it is written the type of the product it sells (For Example: “Red lentil”in the title).