They’ve provided the example markup for a regular input-text form:
<form class="form-horizontal">
<fieldset>
<legend>Legend text</legend>
<div class="control-group">
<label class="control-label" for="input01">Text input</label>
<div class="controls">
<input type="text" class="input-xlarge" id="input01">
<p class="help-block">Supporting help text</p>
</div>
</div>
</fieldset>
</form>
But how could I get something like

Just a bit confused on how the markup would look for a select list. Thanks!
Bootstrap 2.3.2:
Bootstrap 3.x:
col-sm-2andcol-sm-3define the widths for you can change accordingly. Have a look at the Grid system on the Bootstrap site to see the different variations.Hope this helps