BOLD
<B>PUT TEXT HERE</B>

Underlined text
<U>PUT TEXT HERE</U>

Italic text
<i>PUT TEXT HERE</i>

STRONG
<STRONG>PUT TEXT HERE</STRONG>

Combine all
<B><I><U>PUT TEXT HERE</U></I></B>

HELLO_subscript
_{YOUR WORD HERE}

HELLO^superscript
^{PUT TEXT HERE}

Changing text size/color
<font face="tahoma" size="2" color="000000">PUT TEXT HERE</font>

BIG
<BIG>PUT TEXT HERE</BIG>

SMALL
<SMALL>PUT TEXT HERE</SMALL>

Emphasize
<EM>PUT TEXT HERE</EM>

Typewriter text
<tt>PUT TEXT HERE</tt>