Modifying my own topic title

Go back to the OP of the thread, and because it's your post you can modify it, so do that.

From there, change the subject once you're in the modification screen and save the change.
 
Another way of doing it, not used often I think, is double-clicking of your topic from the board it is on (not the title-text, that'll just take you to the topic). Then the title changes to a input-box, you can insert your new text there and then click away.

This is for if you don't need to edit other content within the thread.
 
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