How to report a bug to Xilinx ?

Hi

When doing a customer project, I found a bug in Vivado 2017.2.1 related to use of Artix device, and I have created a project for the Digilent Cmod A7 board that shows the problem.

But I can't figure out how to report this bug to Xilinx through the Service Portal, event though the introduction text says:

Service Portal

Open a Service Request to get connected with a Xilinx expert. Get help with using and troubleshooting our products through every step of the design process.

? So how can I report this bug to the technical people at Xilinx ?

Please help...

I didn't find the right solution from the Internet.
References
https://forums.xilinx.com/t5/General-Technical-Discussion/How-to-report-...
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