Add the tag {{rfc|xxx}} at the top of a talk page section, where "xxx" is the category abbreviation. The different category abbreviations that should be used with {{rfc}} are listed above in parenthesis. Multiple categories are separated by a vertical pipe. For example, {{rfc|xxx|yyy}}, where "xxx" is the first category and "yyy" is the second category.
This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title bar; if not, it is fully visible.
To change this template's initial visibility, the |state=parameter may be used:
{{RFC list footer|state=collapsed}} will show the template collapsed, i.e. hidden apart from its title bar.
{{RFC list footer|state=expanded}} will show the template expanded, i.e. fully visible.
Template documentation