How do I add a node to web.config

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IIS

C#3.5

Hi there, please I need some assistance before I tear my eyeballs out lol... XD

I am trying to add the below node to web.config under system.web...

<identity impersonate="true" password="password" userName="userName" />

Using (Microsoft.Web.Administration) library however I am failing badly.

What I have tried:

The below code is where I am at.

Configuration config = serverManager.GetWebConfiguration("Default Web Site");
ConfigurationSection applicationPoolsSection = config.GetSection("system.web"); // ===> This says that I need an extra //section, if I change it to "system.web/?" ?=anything... it will fail at addElement.
ConfigurationElementCollection applicationPoolsCollection = applicationPoolsSection.GetCollection();

ConfigurationElement addElement = applicationPoolsCollection.CreateElement("identity");
addElement["key"] = "impersonate";
addElement["value"] = "true";

applicationPoolsCollection.Add(addElement);

serverManager.CommitChanges();

Below is the snippet of my web.config...

<system.web>
<!--Some code here including handlers....-->
<!--The below line needs to be added at runtime from a different app as the installer (made by someone else) creates the app and pools in IIS-->
   <identity impersonate="true" password="password" userName="username" />
		
</system.web>