The screen may say 'You've successfully granted access to iWedding Deluxe! Simply return to iWedding Deluxe and enter the following PIN to complete the process'.
We do/did not intend you to have to perform these steps - they are usually automatic and performed in the background. If you see this screen simply tap cancel to exit the twitter login and you can continue to use iWedding Deluxe - BUT we recommend you deactivate the Twitter integration in the 'Settings' app until we can publish an update as it will ask you to attempt to log in twitter every time you open the app.
If you have already logged in before the problem you should be able to continue using twitter.
Example of screen:
Update out ASAP
Regards
iWedding Deluxe Support