Start out with Quick Search by entering either a kanji itself, its Onyomi in katakana, Kunyomi in hiragana or its English meaning into the search field. If your search produced many results, click on the “Sort” icon to view these kanji grouped in different ways.
Next, learn how to use the flexible Advanced Search syntax. This allows you to search for kanji in romaji or Japanese using all available categories including radical, stroke, grade and textbook (e.g. by entering
on:shin to find all kanji with the onyomi “shin” or
grade:2 to find all Grade 2 kanji).