Hi!
You can enter the connection information manually in PGAdmin. Create a new server (Servers > right-click > Create > New Server).
Under the new server ‘Connection’ tab, enter the following:
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Host name/address: The host name is the part of the external connection string between the ‘@’ and your database name. For example oregon-postgres.render.com
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Port: Default is 5432
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Maintenance database: Render database name
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Username: Render database user name
When you save and connect you’ll be prompted for your password. You can choose to save it with the connecting in PGAdmin.