Subforms rarely come out the way you want them to the first time: They may need to be resized so that they fit nicely in the main form. You may need to change the subform layout.
The main form and sub form each have their own set of navigation buttons that you can use to add and move between records.
If you have set referential integrity between two or more related fields in a subform's underlying table or query, you will have to obey those referential integrity rules in order to add or edit a record in the subform. For example, you can't enter a number in the TourID field unless that number exists in the qryCustomerTours query.