I have been using octoprint for several months now.
I was able to get everything working by watching a youtube tutorial.
I am connecting to my home router.it is secured with a password.
I recently noticed the address bar is red and says not secure.
Unfortunately I am not that knowledgeable in this area. as stated I needed a tutorial to get this far.
It is more than safe enough to use on your local network, with trusted users. It is NOT secure to use like this over the internet. Your browser does not discern between these two scenarios.
They can be had for free (https://letsencrypt.org/), but installing them is not entirely trivial, especially for local use. Then again, for local use it is not necessary to use https, as long as you can trust the users of your local network.
I assume that this is a private IP address like 192.168.x.x or 10.x.x.x but not something else. If it's a valid public IP address then Chrome probably should warn you.