I built my website some time back and now Id like to optimize it for mobile, but it seems the older builder doesn't even have the option for mobile view. What are my options?

i paid for my website, but it won't view when i type it on my commputer. an error message comes up stating this sight is not secure

i paid for my website, but it won't view when i type it on my commputer. an error message comes up stating this sight is not secure

I was having trouble with a "mobile view" gallery and called to find out where/how to create a different looking mobile gallery. I was told I couldn't do that.  I know I can, just forgot how.  I asked the guy "Phil"  ha ha ha-not his real name -- how come he didn't know this.  H