Customize reports

Dear Technical team, i've tried to create a custom report template for resizing the graphs using the below tutorial :

https://kb.paessler.com/en/topic/76600-how-can-i-change-the-size-of-graphs-in-reports

in step 4 , i cannot see any category:name (with grey background) you mentioned in the source code , i cannot see any new template in template selection drop down by using this template :

<!--Graph only (Data Files Not Available): Changed Graph (5 min interval)-->
<!--10-->

<#include file="includes\reportheader.htm">

<#objectproperty name="reportheader">

<#report type="list" name="details\Graph plus 30day graph_custom.htm" subname="details\Detail Loop.htm" graphaverage="300">

<#cropmsg>

<#objectproperty name="reportfooter">

<#include file="includes\reportfooter.htm">

I'd be appreciated if you tell me where should i change the name of the duplicated source name so i could have the new template in drop down. thanks in advance.

customizedtemplate newtemplate reports-resizegraphs