Change object property and delete object

I have an Object which consists of objects with properties. I want to change the property of one of these objects.

I tried the following:

$Object | Where {$_.ID -eq $GetID} | Set-ItemProperty -Name Count -Value $TotCount 

But it doesn’t work.

I also try to delete the following object:

$Object | Where {$_.ID -eq $GetID} 

Or just $_