You could add an unbound text box for searching, then use the
After Update event of the text box to run the code. Something like;

Dim strSQL As String

strSQL = "Select tblMeetings.DecisionNumber, tblMeetings.Date, " &_
             "tblMeetings.Decisions From tblMeetings Where " &_
             "tblMeetings.Decisions LIKE """ & "*" & Me.txtSearch & "*" & """

currentdb.Execute strSQL, dbFailOnError

Or if your form is based on a query then you could apply a filter like;

Dim strFilter As String

strFilter =   "([Decisions] LIKE """ & "*" & Me.txtSearch & "*" & """)"

Me.Filter = strFilter
Me.FilterOn = True

You'll need to modify table, field & control names, adjust for line wrap,
quote placement etc., but this may give you a couple of things to try.

BTW - Access has certain words that are "reserved" (like Date) that should
not be used for field and control names. For a list of these words and why
you should not use them see;

http://allenbrowne.com/AppIssueBadWord.html