The legal way (which involves paying for the music):
Go to the Amazon website. (There are others but I'm trying to keep it simple).
Enter the title of the song into the search bar. (If it's been recorded by lots of artists, it might help to add the name of the singer or group as well).
Underneath the search bar you'll probably see the title duplicated, with 'in digital music' appended to it. Click there.
In the results list that follows, click on 'MP3 Download' against the relevant recording.
The click on 'Buy song' on the right.
Do NOT click on 'Try Now' when you see an offer for a trial of Amazon Music Unlimited. Instead, click on 'Continue to Checkout'.
Sign into Amazon (if you weren't already signed in) or, if you need to, follow the 'New account' procedure.
Pay for the track with your debit/credit card.
You'll then get to a 'Download' button. Click on it.
Navigate to where you want the file to be saved on your computer (e.g. within your 'Music' folder) and save the file to there.
It will then be accessible to Windows Media Player.
The illegal way (= 'stream ripping') without paying for the music:
Go to Youtube.
Search for the song.
When you've found it, RIGHT-click in your browser's address bar, to highlight the web address.
Select 'Copy'.
Go here:
https://www.onlinevideoconverter.com/mp3-converter
Right-click in the box at the top of the page and select 'Paste'.
Click 'Start'.
Wait for the conversion to complete.
Click the 'Download' button.
If you're asked whether you want to open the file or save it, make sure that 'Save File' is selected. Click 'OK'
When the dialogue box opens, navigate to the file location where you want the file to go. (e.g. 'Music'). Save the file to there.
It will then be accessible to Windows Media Player.
NB (This applies to the instructions in BOTH of the preceding paragraphs): I've got my browser configured so that, whenever I download a file, I'm always asked where it should be sent to (such as 'Music'). Your browser might be configured to
automatically send downloaded files to a standard location, which would almost certainly be 'Downloads'. If you're not offered a choice of where to send the file to, it will almost certainly end up in 'Downloads', so you'll have to find it there and then move it to your preferred location (such as 'Music'). To do so, right-click on the file in 'Downloads' and select 'Cut'. Navigate to 'Music' (or wherever), right-click and select 'Paste'.