If no parameter is supplied:

{{s-rel}}

The format is {{s-rel|parameter}}, where parameter is replaced by a custom name (wikilinks must be added manually):

{{s-rel | [[Religion|Custom Religious]] titles }}

The format is {{s-rel|parameter}}, where parameter is replaced by one of the predefined parameter names shown in the following table. The first column contains the parameter and the second column displays the header.

From the Pope Pius V article:

{{s-start}}
{{s-rel | ca }}
{{s-bef | before=[[Pope Pius IV|Pius IV]] }}
{{s-ttl | title=[[List of popes|Pope]] | years=1566–1572 }}
{{s-aft | after=[[Pope Gregory XIII|Gregory XIII]] }}
{{s-end}}

Same example with {{succession box}}:

{{s-start}}
{{s-rel | ca }}
{{succession box
 | before=[[Pope Pius IV|Pius IV]]
 | title=[[List of popes|Pope]]
 | years=1566–1572
 | after=[[Pope Gregory XIII|Gregory XIII]]
}}
{{s-end}}

• Category:Pages using S-rel template with ca parameter (9,357)
• Category:Pages using S-rel template with or parameter (1)

Documentation for creating succession boxes can be found at Template:S-start/doc.