How do I edit the Character Matrix in SubRip?

[ditz]

Hi Folks

When I made a character matrix in SubRip I've mistakenly used the letter "I" instead of "l" so instead of "call" (for example) I'm getting caII. I can open View/Edit Character Matrix but can anyone tell me how I actually replace the offending "I" with "l".

I know if I highlight "I" in View/Edit mode the character(s) shows up in the right hand pane but I've highlighted all the "l"'s and none show up as "I"?. I hope that makes sense.

I've searched everywhere but I can't find an answer.

Thanks in advance

ditz