Mapped is a tool built around giving you an interface to understand your member lists. It's the primary Datasource Type in mapped, and will always be visible on the map as blue dots.
There's many ways to import your member data, you can upload a .csv with your data, or if you prefer having your data automatically sync to the CRM you are using, we currently are able to integrate with:
Add a member list
It appears on the left sidebar on the dashboard
Use an distinctive name so you don't confuse it with other datasources
For the data type, select Members. This is what designates it as a members data type and allows mapped to know to treat it differently to other data source types