Is there a video or document with step-by-step instructions to deploy my contract on Polygon?

I used the GitHub desktop to fork the repo and copy it to my local drive, but I don’t know exactly what to do next to get my contract into remix
I’m pretty comfortable with Remix now, and even though I’m no expert, was able to deploy some simple contracts to other chains.
I have searched high and low on youtube but can’t find anything specific to taking a contract I made on Manifold and deploying it on Mumbai/Polygon

any help would be appreciated!