In normal use, the personal list allows submitting their own unique listings to their list (the list is a menu item in their member home area) but doesn't allow saving listings from elsewhere. To enable the saving to personal list, go to Admin -> Themes -> Manage Templates -> Listing Bit and add this at your desired location (say just before the </td> at the end):
<IF {THISMEMBERISREGISTERED}>
<IF not {LINKISINMYALBUMS}>
<IF {TID} does not contain albums>
<form action="https://scripts.webmastersite.net/wsngallery/manual/albums.php?add={LINKID}" method="post">
Add to <select name="subalbumid">{THISMEMBERALBUMLIST}</select>
<input type="submit" value="Add" >
</form>
</IF>
<ELSE>
<a href="albums.php?todo=remove&linkid={LINKID}&catid={LINKOURALBUMCATID}">Remove from personal list</a>
</IF>
</IF>
<IF not {LINKISINMYALBUMS}>
<IF {TID} does not contain albums>
<form action="https://scripts.webmastersite.net/wsngallery/manual/albums.php?add={LINKID}" method="post">
Add to <select name="subalbumid">{THISMEMBERALBUMLIST}</select>
<input type="submit" value="Add" >
</form>
</IF>
<ELSE>
<a href="albums.php?todo=remove&linkid={LINKID}&catid={LINKOURALBUMCATID}">Remove from personal list</a>
</IF>
</IF>
Now your members can easily add/remove from their personal list from anywhere on the site. Alternatively, you might prefer to put the above code in the listing details template instead of the listing bit if you only want it shown on the details page.