In order to enable SSRS reports in Yellowfin, you first need to enable this role function. You should then be able to create SSRS reports.
Step 1. Enable the role.
Step 2. Create report.
You need to make sure you already have a connection the SSRS server as a data source. You can then upload file against the relevant data source.
A quick how-to video on this can also be found here : you tube video