Urgent! ! Ask Sweden for the method and process of applying for a British visa! !

Now Sweden applies online, and then goes to the embassy to show the original passport and pay the fee. The time is 5- 15 working days. It's all written online, but it's quite messy. I haven't figured out how much it will cost, but I'll give it anyway. There is also an English address, which I am also confused about. I can't go without an address?

The address of application is here: http://www.ukvisas.gov.uk/en/applyonline.

I also want to apply now, but the exact time has not been decided.