Adding custom report as web part, but couldn't found it

Hello everyone

I'm trying to add a custom made report (on our own cubes) to the AX role center.

When I access the report in the browser of the AX machine, it works.

Printscreen:

But when I try to add it as a web part in the role centers the browse window shows some strange directories. Don't know from where they are (maybe it uses its own report server?).

Printscreen:

Can someone help me adding this report as a web part? How can I get my report in this dialog box?

I'm searching on it for quite a long time now and any help is welcome :)

Thanks in advance!