how do I find an instance of a non-static class?

[memphispg]

hi, I found such a good tool as frida-il2cpp-bridge, looked at several manuals, tried to write a script, but so far nothing has worked. One person said that an instance of a non-static class needs to be caught in runtime, but as a matter of fact, I did not understand In general,I need an instance of the class to change the value of the string "AppIdRealtime", there are no static methods, fields, etc. in the class.; public class AppSettings // TypeDefIndex: 9149
{
// Fields
public string AppIdRealtime; // 0x10
public string AppIdFusion; // 0x18
public string AppIdChat; // 0x20
public string AppIdVoice; // 0x28
public string AppVersion; // 0x30
public bool UseNameServer; // 0x38
public string FixedRegion; // 0x40
public string BestRegionSummaryFromStorage; // 0x48
public string Server; // 0x50
public int Port; // 0x58
public string ProxyServer; // 0x60
public ConnectionProtocol Protocol; // 0x68
public bool EnableProtocolFallback; // 0x69
public AuthModeOption AuthMode; // 0x6C
public bool EnableLobbyStatistics; // 0x70
public DebugLevel NetworkLogging; // 0x71

I found the code of another person who would have the same question, but I have no idea how to use it, there are errors there (according to vscode);

function findInstance(className : string, numberOfMethods : number) : Il2Cpp.Object {
const im = Il2Cpp.Domain.assembly('Assembly-CSharp').image;
const cls = im.classes
let myClass = im.tryClass(className);
for (const c of cls) {
if (c.name == className && numberOfMethods == c.methods.length) {
myClass = c;
};
}
console.log("The selected class is ", myClass)

const instances = Il2Cpp.GC.choose(myClass);
console.log("Instances array:", instances);

var classInstance: Il2Cpp.Object = null;
Il2Cpp.GC.choose(myClass).forEach((instance: Il2Cpp.Object) => {
    classInstance = instance;
});
return classInstance;

}

I will be very grateful if someone helps, or tells me how to do it correctly, I've just been struggling with this for almost a week (sorry for the bad English)