Opening tables
On Database view tap on any table in the list, Table view containing the selected table will pop.
Creating tables
On Database view tap "New Table" button, Table view will pop.
Type a name for the new table. Be careful, a name of a saved table can not be changed.
Tap "Add column", a Column view will pop. Read more in "Creating columns". Create columns of the table. Be careful, columns of a saved table can not be deleted or changed, but new columns can be added anytime.
Finally tap "Save table" button.
Deleting tables
On Database view tap on "Edit" button, then select tables you want to delete, finally tap on "Done" button.