When I use the basic selection query, there are no countries to pick from in the Reporters section, nor are there years to choose from in the Years section.  Why is that?

It may due the internet browser that you used. Due to lack of resources, UN Comtrade is best viewed by Internet Explorer 6.x and some pages may not work properly in other browsers.

 As an alternative, you can go to express selection and type code of reporters/partners and years.

 

They appear when I look at it. Are you sure about this? Perhaps can you retry and let us know? Thanks.