Board Thread:Questions and Answers/@comment-31301562-20170514174340/@comment-26203519-20170514214038
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If you're using VisualEditor, simply double click on the image, click on Advanced Settings and choose left, center or right and click apply changes.
If you're using Classic Editor, hover over the image, click modify and under alignment, click on the one on the left.
If you're using Source Editor, place the word "left" in between "thumb" and "px".
If you need any more help, feel free to ask.