The first step is to enable a connection to the source system in question. Some systems need an API token that you need to create in the source system; other systems create analyses, and you need to decide which options to use.
We cover each of these systems in a dedicated video, regarding both the prerequisites (if any) and the configuration options; but in order to start working, the only important thing is to add your API key if the system prompts you. If you do not know how to do it, you can consult the system details in our knowledge base here.
Note: every system requires configuration, and therefore, some pages may not even appear if the system you are connecting to does not need/allow setting up that specific section.