Dasheroo does not allow the embedding of dashboards using an <iframe> and it is not something we plan to allow in the future.
This is a security feature of Dasheroo; it is a relatively common practice with web-based applications, especially those that contain potentially sensitive/personal information like Dasheroo.
We are working on other more secure ways to embed your dashboards in the future. So, stay tuned for more info once that becomes available.