Open Port on FritzBox

Hello Lawrence,

We're glad to look into this & help you.
Please share us a screenshot of the threat notification you received from AVG, so that we can check & help you accordingly.
You can post the screenshot here in your topic. Click on Answer & then click on the Image [mountain symbol] & follow the instructions.
Thanks in advance!

Hello Lawrence,

We're glad to look into this & help you.
Please share us a screenshot of the threat notification you received from AVG, so that we can check & help you accordingly.
You can post the screenshot here in your topic. Click on Answer & then click on the Image [mountain symbol] & follow the instructions.
Thanks in advance!

Hello Community, 

AVG is flagging up that I have an open port on my FritzBox. I do not even know what an open port is but apparently it is a possible weakness in my internet security. 
How do I close an open port? 
I am not very technically minded so a simple reply would be greatly apprecaited. 
Thank you,
Lawrence