editing charts

I'm new to ZOHO and have just started a sheet and added a chart to it. However the resulting chart doesn't look like the ones in the samples and there are things I can't edit.
1. How do I add multiple data ranges? I have one row of data, but I'd like 3 or 4 on the chart.
2. How do I delete a chart? When I click on the DELETE button in the upper right corner nothing happens.
3. Can I add a chart of data on one page of a spreadsheet to another page of the spreadsheet? If so, how?
4. When I enlarge the chart resolution goes way down. Is there any way around this?

Thanks,
Ted