Singapore and United are both part of the Star Alliance so you can use Singapore KrisFlyer Miles to book your United flight.
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Yes. Regardless of which participating Star Alliance member airline you select as your Status Airline, you can convert Star Alliance Points into miles/points of any participating frequent flyer program2, provided, that you are a member of that program. To do this, you must be registered with Star Alliance Rewards.
All you need to do is log into your United Airlines account, and click the section for “Transferring MileagePlus Miles.” Select “KrisFlyer” as the loyalty program you want to transfer your miles to, and then enter your KrisFlyer membership number. Finally, enter the number of miles you want to transfer and you're done!
I booked two business class seats on a Turkish Airlines flight using KrisFlyer points less than three months ago, for September 2023. The flight is from Istanbul to Budapest and I booked it via the Singapore Airlines website using KrisFlyer miles (for 33500 points and USD 58 per seat).
Using milesMileagePlus members can redeem miles on Emirates flights on select routes between Dubai (DXB) and Africa, the Middle East, and the South Asian Subcontinent as part of an award reservation that includes a United flight between Newark (EWR) and Dubai (DXB) all on the same ticket.
It's not illegal to buy KrisFlyer miles. There's a lot of things in your browsing history that will make the FBI kick down your door, but buying KrisFlyer miles is not one of them. That said, the selling of KrisFlyer miles and award tickets is against the T&Cs of the KrisFlyer programme.