You can’t but you you have two options.
Cheat. Open the level list in another browser tab, and copy paste or type in the answer when the radical comes up.
Cheat more efficiently with the override script. When a radical comes up just hit some random keys, it will be marked wrong, then press F and look at the answer, override the radical and when it comes back again then just put in the right answer.
actually @jneapan solution is much better.
Just add the same synonym like “a” to all radicals. just hit a and press enter whenever a radical comes up.
oh and FYI I like the WK radicals I don’t do this lol