This is ridiculous. You can't find answers to basic questions about KrisFlyer.

Swear I've been reading Singapore's website and downloaded brochures, but can't find answers to simple questions. Everything is made so muddy and complicated. Why can't they disclose information in simple terms?

• Does miles expire and what is the expiration period exactly?
• How do I upgrade to Silver or gold? How many miles do I need?
• What are Silver or Gold benefits?
• I have some miles, try to upgrade my flight and t says "flight does not qualify for upgrade. I guess I don't have enough miles for that. But how do I find out - how many miles needed to upgrade - which flight - to which class?
• If I buy ticket for someone my miles credited to me, how about upgrades, can I spend miles on someone else's upgrades?
• If I am Silver/Gold member with access to lounge and flying with someone who is not Silver/Gold. they can't go with me to the lounge?

In general, I am flying once a year from Australia to Europe, getting around 21K miles. Apparently miles expire in a year or so. So I can't upgrade membership or flighs.
So this means whole KrisFlyer is useless to me?