Get BlueBridge Glossary from Store
MS Teams already offers a store for Apps, Tabs and Bots.
You no longer need to switch to the developer preview.
As soon as the teams app or window in the browser is loaded, you can find the Store icon in the lower left-hand corner. Click the Store icon and search or browse for the BlueBridge Glossary.
Click the entry for the BlueBridge Glossary and select the team in the appearing window, you want to add the glossary to. Afterwards proceed as mentioned in the user guide to add the tab to other channels of the current team.