This is the 'Forminput' template. It should be called in the following format:

{{Forminput
|form=
|subpage=yes
|namespace=
|preload=In MAIN only! If not specified, looks for {{PAGENAME}}.
|default=
|name length=
|button text=
|subcategory=
|param template=
|param field=
|param value=
}}

calling: {{#forminput:form_name|size|value|button_text|query_string}} Edit the page to see the template text.