Real problem over viewing mature content in Mylot?

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hey guys i have a real problem over here in mylot.i'm not able to view the mature content in mylot..when i try to see some adult content posts it says:this post contains mature content and you have opted not to view this,you can change this by going to preferences..first of all i didnt opt anything like these and secondly now when i'm going to preferences there is no option for changing the mature content things..so please help me to change the things..