Ans. Long click on list of birthdays to select multiple birthdays and then click on delete.
Ans. Please check your system setting for Birthdays & Wishes Notification.
Ans. No, this app only available on Android.
Step 1: Backup your data in old phone.
Step 2: Copy the backup file from the location (Given in the backup Page) and paste in same address in new Phone
Step 3:Open App in new Phone
Step 4:Open Backup Page and Click on Restore
Step 1. Got to the profile page (you can click on your image or icon on above logout button in side panel)
Step 2. Click on Delete Account
Step3. Click on Yes.
Wait for app to logout, your data will be deleted from our servers.