This tutorial assumes you've already logged in to phpBB
Now let's learn how to prune forums
1) Click Forums
 
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Pruning a forum allows you to remove topics which have gone unused for a specific length of time to save on resources and reduce clutter
2) Then click Prune forums
 
3) Choose a forum here

4) Then click Select a Forum
 
5) Enter the age of the topics you wish to prune here

6) Then click Submit
 
7) Click Yes
 
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That's it! Â The forum has been pruned to our specifications

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This is the end of the tutorial. Â You now know how to prune forums in phpBB