Use "circle" there to appear an English dialog box.
Then use "cross" to select the letter under the cursor, and use "cross" continuously to convert the letters within the cursor.
After selecting a letter, such as "a", press "START" twice in a row.
If you want to choose "JAC"
Use a cross in "jkl"
Use a cross in "abc"
Use a cross in " abc" can be crossed three times in a row