I am trying to set a key for UserName as with respect to this code:

```
{
"CustomerAccount":{
"UserName":"String content"
};

```

I am trying to set the username here, does anyone know how can I set a name in dictionary with levels? 

My code is as:

```
[mutabledictionary setObject:self.uitextfield.text forKey:UserName];

```

however this sets the username below to CustomerAccount not insider CustomerAccount.

Any help here would be appreciated.

Thanks.