Can't find images in files/filezilla

Hi guys,
I have never come across this issue before in my 10 years working with WordPress. I am aware that all images have to be being called from somewhere, however, I cannot seem to find the location of the images in the menu bricks at the following site that I am building https://sheppadviser.com.au/adviser_web/
I am wishing to add my own to it and can’t find their location. You will see a wallet on top of pricing and you will see a phone on top of contact…any idea on where these image files are located?
Please help.

Regards,
David