When you create a report subscription, there will be a step by step wizard to guide you the process.
Figure: Chose report
Figure: Create subscription
Figure: Specify data source
Figure: Specify credentials
Figure: Specify SQL query
Figure: Specify email addressee
Figure: Specify email format
Figure: Specify email subject
Figure: Specify report parameters if any
Figure: Chose Schedule type
Figure: Specify schedule details
If you encounter problems of receiving subscription emails, you may find this suggesteion is useful - Report subscriptions are disabled if a report contains User information e.g. User!UserID