IB shuts down at the weekend, because the markets are closed. So you cannot log into TWS but you can access your account details via the website. There's no point in logging into TWS because the markets are closed. And as it's the weekend and the markets are closed, IB support will be closed too!
You'll find that when the markets open again you will be able to log in. Around 8pm-ish UK time on Sunday evening is when they're open for business again - from memory! So try from about 6pm onwards in case I've got it wrong.