So I got a cool replay, and thought about sharing it in the in-game community replays section, but I can't really seem to get it to work, can you guys instruct me?

Hello there i'll be assisting you, i apologize for the late reply.

Could you please elaborate a bit more on what doesn't seem to be working? i have just uploaded a replay and it seemed to be fine.

If you can provide a screenshot of what is failing would be great!

Oh, there hasn't been any bugs, I'm just asking how do I send a replay to the community tab. Is it on the website?

You want to go to the replay, make sure it has your username as who made the replay. and to the right there's a button that says upload.

so the upload button is not appearing, even with my username
is there something i haven't done yet?

If you're on standalone 5.72 then you'd need to wait for the next update, there's a bug preventing upload button from showing up.
There's a hacky solution involving manually editing replay file contents to have your name be all lowercase, but generally it'd be easier to just upload your replays on forums here: https://forum.toribash.com/replay.php