Need VBA code for search button

I'm still trying to learn VBA for Access. I'm in a bit of a crunch right now and need a simple piece of code...
I have a lookup button on a form. I want to search records by name, but I want it to look at multiple fields on the table and find matches, then give me the option to select a match.

I want to look at either first_name or last_name on Tbl_People.
For instance if I type in "Joe" I want it to return the first and last name of everyone named Joe and allow me to select the record I want.

Using the automated search button allows me to lookup by first_name only. The generated code is below. I can't see where it's even looking at the table, let alone which field based on this code...

Private Sub Command18_Click()
On Error GoTo Err_Command18_Click
 
 
    Screen.PreviousControl.SetFocus
    DoCmd.DoMenuItem acFormBar, acEditMenu, 10, , acMenuVer70
 
Exit_Command18_Click:
    Exit Sub
 
Err_Command18_Click:
    MsgBox Err.Description
    Resume Exit_Command18_Click
    
End Sub

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