how to remove the parental control restrictions in iTunes 12.2

how to remove the parental control restrictions . in setting parental control restrictions is impossible to remove the restriction of non-normative content playback is locked. in iphone and ipad mini 5 is also impossible to change the restrictions on the playing of non-normative content is also disabled. this limitation has arisen after installing OX 10.10.4, iTunes 12.2 and IOS 8.4. How do I solve this problem. Country Belarus account . Can I get help to you as soon as possible .