RE: how does it works to train the bot and how can i do this

No, you cannot correct part of the string in the memory.

It looks like most of your responses also have the correct character, so you should be ok just to delete them from the Memory page. If you don't have the responses to some of them, then you could filter response on the character from the Chat Logs page, export it as a chat log, or response list, then find/replace the character in a text editor, and then re-import it.