An External Database is a Server dedicated to running a single database service. Bunnyshell supported creating External Databases and at this moment this is similar to deploying database packages on a normal Server. In the near future Bunnyshell will support database architectures such as replication, clusters, partitioning and sharding.
From the up right Create button click on the Database button. You can read the following section for a full overview of the parameters
From the Database View click the Actions button and select Remove