I've found once you've seperated the white and blue tabs, the white tab will not stick to the blue tab any more. You have to stick it on in a slightly different spot, to the shell of the diaper itself.
Alternatively, you can also use some diaper pins and pin the white tape to the blue one. They work just as good as extra tape does, but are much easier to carry around, as well as remove later too.
Alternatively, you can also use some diaper pins and pin the white tape to the blue one. They work just as good as extra tape does, but are much easier to carry around, as well as remove later too.