I was trying to register vRealize Orchestrator with vCloud Director 9.5. The steps are documented here. But I had few issues while registering vRO. I thought the steps with screenshot may be useful for you. Please find the steps with screenshots below.

1. Login to vCD HTML 5 Provider as administrator.
   • https://<vcd fqdn>/provider
2. Navigate to Service Management.
   • Hamburger button > Conten Libraries > Service Management
3. Click on Add.
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4. Provide details displayed in the Dialogue box. 
   • vRO display Name
   • Description
   • vRO Hostname
   • vRO UserName and Password.
     • NOTE: If you selected authentication method as vSphere whiel configuring vRO then the user has to be a vSphere user. 
5. Click on Trust Anchor and upload the vRO SSL Certificate (.PEM). 
   • Note: The Certificates CN should match the value provided in ‘vRO Hostname’. 
6. Click OK.
7. You can see that the vRO is registered in vCloud Director!!
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