Pass Username/Password on iFrame Embed with Report Server

Can I pass a Username and Password for a system account to my embedded iFrame on my web application? With my current imlpementation, I can only view the iFrame if the app is on my local machine where I am prompted for credentials. When the app is deployed to the server, nothing loads because I am not able to provide credentials.

If it is not possible to pass the paramaters, is there any way in the current offering to embed a Power BI report from Report Server in my web application? Thanks!