Here are the simple steps to removing the HTML codes
under the comment box in WordPress.

From your dash board go to appearance, now go down to editor and click on it.

From here on the right side find style.css click on it.

Now scroll to the very end and insert this code

click on save and you are done!

Before altering any codes you should always save them in notepad
just in case you need to put the code back to its original form.

Alice McCarthy

This is the code to paste in
.form-allowed-tags{
display:none;
}