To customize migration of certain MS Access table to MySQL, double-click on the appropriate item in listview on the left of "Select Tables" wizard page. Then dialog box appears that allows to specify table name, type and default value for every field using "Field info" group of controls. Also it is possible to exclude columns from conversion result by unchecking the corresponding checkbox.
Note: listview on the left of "Edit Table" dialog window contains column attributes for the original Microsoft Access database, new custom types and attributes will be displayed in "Field info" controls when the corresponding item is highlighted in the listview.
Inaccurate modification of table structure may break the database integrity (for example, loosing indexes or foreign keys). Users should be very careful with "Edit Table" feature.