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The best way to use Plabforum is as a website with multiple tabs open and exploring, studying and researching everything. Using it over an app limits you with only one tab but if you prefer an app-based interface then you can download Discourse Hub app. 
After you download the app, it will ask you enter the channel address, ie https://plabforum.co.uk/. Copy & Paste this URL. Hoping that helps!
If you have any further queries, don’t hesitate to ask.