Hi aurelia,
If you type in what I have, but do not put any spaces in, the format for bold, italic and underline is the same. The only diff in the opening and closing format is the foreward ( / ) slash after the left facing arrow ( < ), in the closing part of the highlighted (bold, italic or underlined) text.
It does not matter if you use upper or lower case for the B, I or U ( b, i or u ).
< b >*text* < / b > or < B > *text* < / B > but, no spaces, from the first < to the last >
hope this makes it clear for you, if not send another post on here..