Apparently, the Oanda support in Myfxbook is not available to Oanda FXManagers. It is disappointing. Hopefully, they have plans to enable support for FXManagers in the near future.

Myfxbook reinstates Oanda accounts

A piece of good news, Myfxbook and Oanda finally gotten together to resolve the support for Oanda accounts on Myfxbook. We encourage all Oanda FXManagers to make use of this useful analysis facility.

http://blog.myfxbook.com/2011/11/14/oanda-accounts-are-supported-again/