<p>To start this assistant again in the future from the main window of
<span class="application">Thunderbird</span>, choose
<span class="menuchoice">
<span class="guimenu">[[!img lib/open-menu.png alt="Menu" class=symbolic link=no]]</span> ▸
<span class="guimenuitem">Account Settings</span>
</span> and then, from the <span class="guilabel">Account Settings</span>
dialog, choose <span class="guilabel">Account Actions</span> ▸
<span class="guilabel">Add Mail Account…</span>.</p>