If you have successfully registered your vRealize Orchestrator (vRO) in the vCenter Web Client you can add your workflows as a context action. Follow Add vRO 8.x extension to vCenter Web Client for details on how to register the vRO in vCenter. What does context action mean. Well it means that your workflow becomes selectable from the vRO menu item in the vCenter Inventory. For example you add your workflow to a context action of a virtual machine. If you then right click on any virtual machine and then select vRealize Orchestrator -> Run Workflow… you can then select your workflow. In order for this to work you must define what inventory object should be linked with what workflow. If an input parameter of your vRO workflow is of type Virtual Machine you would want this to link to Virtual Machine objects in the web client. That way your workflow will get pre-filled with Virtual Machine from which you started the workflow from. Here are the steps for adding the context action.
If the integration of vRO as extension was successful you should see a new menu item on the home screen. Click on the vRealize Orchestrator menu item.
If you successfully connected your vRO server to the vCenter Server. you should see your vCenter Server on the home screen of the vRO menu.
Click on Context Actions and then on Add to start adding your workflow.
Now enter the name of your workflow in the search field and hit enter. The workflow should now show in the list below. Check the checkbox next to your workflow. Select the type of object you want to associate your workflow with. Meaning which vCenter inventory object should show your workflow. If you only have one vCenter inventory object, this field will be pre-filled. Click ASSIGN and you are done.