Simply format your blog, then in View HTML mode, add id="ID_NAME" to the heading element, and insert the link #ID_NAME to the section in the table of contents.

Table of Contents

1. Heading One
2. Heading Two
3. Heading Three

Heading One

Lorem ipsum yo momma sit amet.

Heading Two

Lorem ipsum yo momma sit amet.

Heading Three

Lorem ipsum yo momma sit amet.