Hi Bird Girl,
To help you further with the pop-up blocker issue we need to validate the following information:
1. What is the Operating System you use?
2. What is the version of MSN Software?
Things to try:
Sign into Msn account using your email id
Click on Help and settings
Click on settings
Click on Select pop-up Guard settings
Click on Filter Settings
Select Filter and show useful pop-up windows and pop-up windows added to the pop-up allow list
Click save changes
How to find the version of MSN Please check the link below
Please revert back for further assistance.