Your first two minutes
No repo required for this. You can link one after you have seen the thing work.
01 Create an account
Email and password, or GitHub. GitHub is worth it because it links your repos in the same step later.
02 Describe your product
Two sentences on what it is for, and a line on who it serves. This is the yardstick every piece of feedback is judged against, so being honest about what you do not do is worth more than being impressive.
03 Paste one piece of feedback
Anything real. An old feature request, a support message, something a user said on a call.
04 Read the report
You get the intent, the reasoning, three judgements and a proposed change. Accept it or reject it.
Accepted reports go into a queue. Link a repo and the release step turns that queue into pull requests.