In order to delete a baseline, the user having administrator role in RMsis must enable the configuration for deletion of baselines by clicking on the check box for "Enable Baseline Deletion" from RMsis Administration > Configuration > Application .

Please ask your RMsis administrator to enable the baseline deletion.
You can also refer to these short videos for detailed explanation about enabling baseline deletion and deleting a baseline [Though the audio / video quality is poor (we are working to improve it), but we hope that it should give you sufficient insight into the product]
- RMsis Administration : http://docs.optimizory.com/display/dp/RMsis+Administration+-+Part+2
- Requirement Baseline and Versioning : http://docs.optimizory.com/display/dp/Requirement+Baseline+and+Versioning

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