If you feel you have found an actual bug, you click the box at the top right that says “+ New Topic”
Move your mouse to the title box and click it - enter a title.
Move the mouse back to the post box and enter your bug report text. Hit “+Create Topic” at the bottom left of the post box.
Edit - before posting, you might want to check the “Things that are not bugs” post as well. It covers many common misconceptions and game mechanics.
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