To type in bold, italics, and underline in ichat, use the following:

<b> Hi there! Will give you Hi there!
<u> Hi there! Will give you Hi there!
<i> Hi there! Will give you Hi there!

You can intermix these commands
<b> <u> Hi there! Will give you Hi there!
<b> <i> Hi there! Will give you Hi there!
<u> <i> Hi there! Will give you Hi there!

and you can use all three together <b><u> <i> Hi there! Will give you Hi there!