From the screenshots, it looks like you selected the "Experience Platform Launch" source. That link actually takes you to a separate interface (now called "Data Collection" instead of Launch) and you would need access to that interface.
Do you have access to the Adobe Admin Console (https://adminconsole.adobe.com/) to manage your own permissions? If not, you need a system admin at your company to give you access to the features you want to use. For most Sources you need the Data Ingestion -> Manage Sources and View Sources permission items in Experience Platform. Launch (now Data Collection) permissions are managed separately.
If you are brand new to Platform, I suggest going through this tutorial in your sandbox. It covers things like user permissions: https://experienceleague.adobe.com/docs/platform-learn/getting-started-for-data-architects-and-data-...