Not working

Hi justin

Installed in 3.6.1 and also in dev version of 3.7 beta 1, but it not showed me metabox as per in screenshot provided by you. also checked in screen option for that.
Any idea or suggestion how to get it.

Thanks and Regards
Shrikant Bhavsar.

https://www.ads-software.com/plugins/custom-background-extended/