To access VCM, you need to have Virtual connect Modules in the interconnect bays.
Cisco Catalyst Blade Switch 3020 modules cannot be managed by VCM. You should have atleast 1 VC module to access the VCM.. This is the reason why you do not see a link to VCM.
References:
https://support.hpe.com/hpesc/public/docDisplay?docLocale=en_US&docId=emr_na-c01009086( Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide)
Cisco Catalyst Blade Switch 3020 for HPHardware Installation Guide: https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-c01009050
Kindly let me know if you have further queries.