Help re Number Formatting

Help re Number Formatting

Hi guys, I've just started using Zoho Sheet and I really like it.

I was wondering if there was a Help Section anywhere? I've looked but I can't find one...

Purely for appearance sake I'm wondering how to format numbers...is there the option to format a range of cells, for example so that 20000000 appears as 20,000,000? I've a feeling that I'm missing something terribly obvious

Thanks,

P.