[SkyCatcher]

You add the code to the templates....for example:

------------------------------------
calendar_smallmonth_day
------------------------------------

<!-- a single day on the small calendars -->
<td class="<if condition="$show['highlightweek']">alt2<else />alt1</if>"<if condition="$show['highlighttoday']"> style="border:solid 1px red; font-weight:bold" title="$vbphrase[today]"</if>>
<if condition="$show['daylink']">
<if condition="$dontshowweek"><span class="smallfont"></if><a href="$vboptions[bburl]/calendar.php?$session[sessionurl]do=getinfo&amp;day=$year-$month-$day&amp;c=$calendarid" title="$eventdesc">$day</a><if condition="$dontshowweek"></span></if>
<else />
<if condition="$dontshowweek"><span class="smallfont">$day</span><else />$day</if>
</if>
</td>

open your adminCP and click styles then edit your style and select the dropdownlist, clicking on edit templates.

Then select the calendar_smallmonth_day and add the code to it.