Help with iChart

This time I have a really stupid question.

I have a SQL query that returns 2 columns per row: a value and a timestamp.

I'd like to plot this data on an iChart.

What should I do?

I've already managed to make the timestamp appear on the X axis (by mapping it as a "Value Column" at the Data Mapping tab and by setting it as an "X-axis Value Column" at the X-Axis tab).

But how do I tell xMII about my Y-axis value?

I'm sorry to post this kind of question, but I've already lost an entire day on it and still couldn't make it work.

Thanks in advance!