Sashasandy:
You are not editing values in the list of the lookup control. This is what you asked for - not what you actually needed, and to confuse matters more, the posted code acts as a red-herring sending us off on some other tangent.
Instead of what you asked and posted code for, what it appears that you needed was to be able to change the value stored in field [Comments]![comment] while limiting it to a known set of values.
If you had clearly asked this question to begin with, we would have had you to that lookup field within a post or two.
BTW: Sashasandy, this is basically the same question you asked in your last thread.
How to Customize an IF Function in vba using a form. Although I am flattered that you used the "Select...Case" construct, I would still suggest looking at Seth's solution using the table and ranges. In fact, using the lookup field you can base the values on a table, once again, making it easier to maintain.
jimatqsi:
As I'm sure you've realized by now, what Sashasandy was asking for was a way to change the value in the field [Comments]![comment] using a standard set of values. Replacing the text more than likely with a numeric.
In anycase, what Sashasandy solution is simply, as jimatqsi well knows, a simple lookup-field... one of the more common tools that we use in queries and forms.