Thanks for your question. It depends on the browser that you are using.
If you are using Firefox
1. Right click on your mouse
2. First selection in the drop down box is Undo Add to Dictionary
If you are using Google Chrome
1. Right click on your mouse
2. Select Spell Check > Languages
3. A screen will pop up. At the bottom, click on Custom Spelling Dictionary
4. Another screen will pop up. You will see your recently added word.
5. Click on the "X" beside the word
6. Click "Done"
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