Windows Live Mail - How to Set it Up

Question

I've been trying to set up Windows Live Mail to display emails received by my BT Mail account.
None of the detailed instructions on the Internet correspond to the Wndows Live Mail screens that appear during the setting up process.
In addition to the above problem, Windows Live Mail asks for ingoing and outgoing details. I've been using imap.btinternet.com for ingoing, port 993 and smtp.btinternet.com for outgoing, port 465, all gleaned from BT on the internet (although I've lost track of where that all came from during my hours of searching).
At the end of the hit-and-miss set up attempt, the user screen in Windows Live Mail (which looks a lot like the old Outlook Express screen) displays my email address in the left column, along with some folder names that were there before I started setting up, but it won't display the folder names corresponding to my BT email address and it won't display any emails. Basically, my actions have only worked to the extent that my email address is displayed, but that's all.
Can anyone please give a detailed, step-by-step description of exactly what needs to be done from absolute scratch, such that a three year old with no computer knowledge could complete it successfully.
Thank you if you can help.

Answer 1

Many thanks for both replies and the links in the second reply.
I've digested the first recommended link and carefully followed the second recommended link, following the further sub-link therein for 'Windows Live Mail'.
As per my original post, there are differences between the recommended link screens and the screens that appear in the version of Windows Live Mail I've downloaded from Microsoft and installed.
Thus:
(1) - 'login user name' in the recommended link appears as 'login ID if different from email address' in the Windows Live Mail software. The recommended link completes that entry as 'example.user', which is meaningless. Is that my BT email address, without the '.com' extension? Then again, applying straightforward logic to the instruction, since my BT login ID is my email address, then the entry should be blank, should it not? Therefore, I've left the entry blank. If that is incorrect, what should I enter, please?
(2) - Continuing completion of the entries from top to bottom, I eventually come to the 'outgoing server information' entry, most particularly the port number. I've entered '465' as the outgoing server information port number. Continuing further, when I subsequently tick the box against 'This server requires a secure connection (SSL)', the port number entered earlier is altered (without any other action by me) to 25. I can go back and change it back to 465, which is what I've done. Is that correct, or should I allowthe software to impose 25?
(3) - I then discover that the 'NEXT' button is greyed out. I therefore can't select 'Next', so, having completed the entries in the window, I'm currently stuck there.
Any help would be gratefully received, with thanks.