To search text within the Description field, you need the InStr() function.  For instance, the SQL below:

     SELECT * FROM ChronicleT WHERE InStr(1, Description, "book") <> 0

will return records where the Description field contains the text "book" somewhere in it.  Words with partial text "book" (e.g. Facebook, books, booked, etc.) will also be included.  It looks for exact matches of the text (spaces and other special characters included), so misspellings will be a problem.

Kevin, do I add that SQL script in the Description field Criteria?

Or is that VBA code in the form?  I don't understand how to apply that SQL.

On your first picture, under "View" at the top left, click that V-shaped button to open up the SQL screen, where you type the SQL statement (correct my misspelling first).  There are other issues to consider too.  My SQL above only searches for "book."  To allow your users to specify any search words, it takes more work.  One way is to create a "parameter query" that accepts user inputs.  Another is to use VBA code to get user inputs and construct the SQL statement.  I don't know your level, so refer to Richard's courses.  I've never taken any of his courses, so I would defer to Richard and others regarding what courses you need to do all of the above.

A couple of the videos Kevin might consider valuable for you are:

Parameter Query
Direct SQL View

I've never used SQL, so I will check out the videos.