To remove any of the keywords you added, do the following:
  1. Click on the names of the desired keywords in the Keywords list to highlight each one. (You can remove more than one keyword).

  2. Click on the Delete keyword button (or hold down the Alt key and press the D key).

You should see those keywords disappear from the Keywords list.

The keywords are not actually removed from Rexx Center's F1 system until you save your modifications.