Adding lyrics to iTunes

Okay. Assuming that it's not one of the folders in the file path that's restricting you (by being Read Only), the question is; at which point does the procedure not work as expected?

I'm using iTunes 12/10/8/5 and I am still able to add lyrics to songs, as follows:

1. select song and use one of the following methods to inspect the song:
   1. on iTunes' top bar menu, click on Edit/Song Info
   2. right-click the target song and choose Song Info from the pop up menu
   3. use the keyboard shortcut command CTRL+I (that's the Control key and letter "eye", not "one")
2. with each method above, that displays the Details tab for the song (and I have successfully tested each one of them just now)
3. select the Lyrics tab
4. click on the Custom Lyrics box to add the tick. Until you select this box, you cannot add lyrics
5. now you can paste in, or type in, lyrics
6. click OK

Here's one I prepared just now:

Once I enable the lyrics option, I typed in a test text and saved it. Upon re-opening the song information, the lyrics tab now looks like this:

Note that the line to the left of the word "text" is the cursor which blinks, and is in position to type in additional lyrics.

The feature is still available. Make sure that the song is not Read Only.

Using Windows File Manager, examine the properties for the song and check the Read Only flag. It needs to be off.

I'm glad that you've got the issue solved.