To import from Bridge you will need to create a new group through the "Add Group" page. This connection will pull all users from the account into the group you are creating. You will also need to know the domain of the Bridge account you want to connect to, the API Key, and the API Secret. Once, you enter a name for the group, click on the "Third-Party Integration" tab an choose "Bridge" from the "Import Type" dropdown menu.
This is the full domain of your Bridge server (make sure you include the https://). This domain should look something like this: https://<company>.bridgeapp.com.
API Key & API Secret
The API Key and API Secret are provided by Bridge when you create a new API token. From the Admin > API section click on the "+ Add Token" button. The following window will open where you can create your token.
For the "Role" you will need to select "Author." You can then enter any name you like for the "Token Name" and "Expiration Date" for as long as you want to be able to re-sync the group. Once you click save, a new modal with your API Key and API Secret will open. Simply copy these values into fields in the Portal form and then click "Test Configuration" to test the connection.