How do you get Libre Office to grammar check.

The program will do the spell check, but will not do a grammar check. On the spell check screen there is a checkbox for Check Grammar, but there is no way to check it. I even downloaded lighttool but got an error loading it. I really could use the grammar check. Please tell me what I can do to get this fixed.

Push come to shove, copy and paste in Grammarly.com.

Try LanguageTool.