If you need to fix one line of furigana you can generate a new image here

Horizontal rules separate each verse. It needs one paragraph with the Kanji one paragraph with the English. Any paragraphs between the Kanji and English will be ignored. Then the definitions can be added under those and they need to have an "=" in the first line.

For the definitions it parses them out as "Kanji (hiragana) =" to generate the Furigana and ignores everything else

Optionally you can include "Timing" and "VerseType" lines. Their placement doesn't matter.

Add a line like "Timing: 0:35 - 0:67" within the verse to set the timing value for the top right corner

Add a line like "VerseType: Chorus" or "VerseType: Bridge" within the verse to set the type of the verse. This will cause the slide for the verse to use the corresponding background image if one has been supplied.

Any lines including "source:" will be removed