Follow the instructions in the installer to complete the installation
EA Installation folder will look something like C:\Program Files (x86)\Sparx Systems\EA\
Login to Prolaborate and open a repository
Go to Menu > Repository Settings and enable Diagram Editor
When you are collaborating with your peers on the architecture diagrams or views and there are comments flowing in to add a requirement, connect requirements, edit a process, introduce a new activity, etc., all you have to do is just click on the icon shown in the screenshot.
The following page will show up. Click on Open Diagram editor.
Enterprise Architect will open and the diagram will load. (If Security is enabled, you will be prompted for credentials)
You can make the changes, save it, and go back to Prolaborate to reply to the comment.