Changing Data in a Plist

Hey, alright so I have a .plist that looks like;

<plist version="1.0">
 <key>Item 0</key>

In the app I have it so that when one of the rows (The data is put in a UITableView) is selected it pushes to a new view controller. I would like also to set the ‘EditThis’ boolean to yes, so the edit view controller can learn which to edit. However I can’t seem to figure out how to change the value. Any help is much appreciated.

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    Load the plist into a mutable dictionary:

    NSMutableDictionary *plist = [NSMutableDictionary dictionaryWithContentsOfFile:@"file.plist"];
    [plist setObject:[NSNumber numberWithBool:YES] forKey:@"EditThis"];
    [plist writeToFile:@"file.plist" atomically:YES];