The fire wall prevents me using on line banking

Hi Diane,
Please provide us with more information (detailed description, screenshot) so we can better understand what issue you are dealing with.
Thanks

Diane, Assume that you are referring to the firewall within AVG Internet Security?.. 
Have a look @ these 2 articles…
[1] (https://support.avg.com/SupportArticleView?urlname=Allow-application-in-AVG-Firewall)  
[2] (https://support.avg.com/SupportArticleView?urlname=How-to-allow-or-block-all-connection-to-specific-IP-address)  
AVG Guru

Hi Diane,
Please provide us with more information (detailed description, screenshot) so we can better understand what issue you are dealing with.
Thanks