To introduce a customer parameter, simply use the dialog:
after creating a new parameter, ensure that the xslt has the following entries:
1. At the bottom:
<ParameterBinding Name="TitleInner" Location="None" DefaultValue="Our Clients"/>
2. At start:
<xsl:param name="TitleInner">Our Clients</xsl:param>
Then you can consume/use the parameter as follows:
<div class="col-lg-12">
<h2><xsl:value-of select="$TitleInner" /></h2>
<hr />
</div>