Well I am using quite different instalation because I have HA in docker on Raspian.
So I have easy access to my shell 
Basically You need to access to shell command on your Raspberry.
I have no access to my system now but there is the addon on HA, which allows you to have shell access. It is called SSH & Web Terminal
There you need to type the: i2cdetect -y 1
It may be you need to install two dependences:
sudo apt-get install -y python-smbus
sudo apt-get install -y i2c-tools
at least second one provides i2cdetect
Hope this helps a bit.