I have spent a lot of time and money on puzzles, and with the discussions I have seen in the forum, I really can't trust anyone except the forum administrator. I would like to ask the forum administrator to introduce me to a way to communicate before it's too late. Thank you.
Why would you trust the forum admin? I won't be surprised if the admin does not even know about this particular puzzle. This forum is pretty big.
You should find someone you can really trust if you can't trust yourself. Or learn how to do it properly on your own if you actually do trust yourself.
After all, the process is not that complicated once you know things such as how mining works and how TXs are being broadcasted.
I can write you a quick instruction without you sharing any personal info. It's just step by step doing things on the offline device to make sure nothing leaks out.
This is a general procedure how to broadcast your TX privately and it does apply to any TX which should be private until confirmed by miners, it's not even specific to this puzzle.
You don't need to trust anyone as you don't give away any info.