To control Error Page

Hello,
I have a question dealing with error pages.
I’m using “kleo” theme and got basic template of 404 error and I customized it.

But these are the problems.
First, when using HTTP Method(TRACE), 405 error occurs.
Is there any solution to deal with this issue?

Second, when I type a little bit different from the url, it occurs 404 error, and that is not the page that I customized.
For example, the correct url is https://10.10.10.10/wordpress, but when I input https://10.10.10.10/word, then 404 error occurs.

When I made a homepage with Java on JEUS, I configured error page according to the type of error on the web.xml file. But I can’t find the equivalent file of web.xml that I can designate the error page for each error type.

Can you let me know where can I set the error page that I made?

Thanks.