Zoho Creator

I never really use database applications but the video inspired me. I'm on the "Create new application" page and there is a button called "Import XLS", what is surprising is that I cannot import an XLS document from Zoho sheet. I can paste the data copied from my Excel spreadsheet, but I don't have Excel or any alternative installed right now due to incompatibility with OS X Leopard. I have now managed to copy and paste the data from a spreadsheet in Zoho sheet.

What I would most like is for people to add themselves to database, but only be successful if they are over a certain age, but without having to give their age. I would also like statistical data to be possible based on the database of people. Also can some columns auto-fill with the month and year of creation?

Even more important would be the option of being able to send HTML email to people listed in the application. I hope this is, or will be, possible soon. Thank you.
ian