How can I publish the H145 livery I made into the flight sim, I cannot figure it out.

Have you purchased and installed the helicopter?

I'm somewhat confused, I'm afraid.

When you say publish, do you mean that you have a livery you want to load into flightsim.to, or have you downloaded a livery that you want to use with the 154?

If the latter, you just unzip it, find your community folder, and put the unzipped pack into it. The location of your community folder will depend on which version of MSFS 2020 that you are using.

Here's a guide showing you where it should be:

https://support.justflight.com…community-folder-msfs2020