Hi intothewideblue,
You don't have Google feedburner account? Create one from feeds.feedburner.com. After creating, goto widget settings in wordpress dashboard and type your feedburner name (not full url).
For example:
If your feedburner address is feeds.feedburner.com/intothewideblue then your input for RSS field is intothewideblue.
Try increasing width size of the widget to 250 or 300.
Thanks and Regards,
Manivannan M