Newbie issue, i cannot seem to be able to use Grafan dashboards

[abreingan]

Hi and thanks for a very useful integration, I have Teslamate, PostgreSQL and Grafana installed, using the excellent Teslamate discovery to populate the HA device and entities. All that works well.
However when I go to the Grafana Web UI I was expecting to see the dashboards (which Teslamate log suggests have been stored in the folder.
Instead I see whati think is the initial Grafana screen, with no dashboards.
Then I tried to add a data source but this failed with Validation error, invalid URL, despite using the same entries as PostgreSQL.
Further i can find no way of defining a select only user as Grafana wishes.

At this point I thought it best to stop and ask for help.