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There is no module or method to post content on the login page but you can do some code mods to make it work.
1. Search and download the BOOX module and install
2. Open the module in administration and create a file and save it.
3. Copy the code it creates and paste where you want the content to appear in /modules/system/templates/system_userform.html
Here is how the code will appear
<{php}>include_once '/home/username/public_html/uploads/loginpgcontent';<{/php}>
<fieldset style="padding: 10px;">
<legend style="font-weight: bold;"><{$lang_login}>legend>
<form action="user.php" method="post">
<{$lang_username}> <input type="text" name="uname" size="26" maxlength="25" value="<{$usercookie}>" /><br />
<{$lang_password}> <input type="password" name="pass" size="21" maxlength="32" /><br />
<input type="hidden" name="op" value="login" />
<input type="hidden" name="xoops_redirect" value="<{$redirect_page}>" />
<input type="submit" value="<{$lang_login}>" />
form>
<a name="lost">a>
<div><{$lang_notregister}><br />div>
fieldset>
<br />
<fieldset style="padding: 10px;">
<legend style="font-weight: bold;"><{$lang_lostpassword}>legend>
<div><br /><{$lang_noproblem}>div>
<form action="lostpass.php" method="post">
<{$lang_youremail}> <input type="text" name="email" size="26" maxlength="60" /> <input type="hidden" name="op" value="mailpasswd" /><input type="hidden" name="t" value="<{$mailpasswd_token}>" /><input type="submit" value="<{$lang_sendpassword}>" />
form>
fieldset>