Just some grammar suggestions for this part of the docs...
Thanks for your suggestions. I applied your grammar fixes, but there are some technical details that are not correct:
You don't log in as guest. As guest is per definition not logged in.
The issue with the terms "visitor" vs. "guest" vs. "user" can not be solved by just replacing the word "visitor" with "guest", as the setting applies to "non-guests" (i.e. logged in users belonging to particular groups) as well if you apply the corresponing options in the groups control panel.
I will be be able to help with at least some of the English version of the documentation for version 1.5, with regards grammar and a typo/spell-check, if the developers so desire.
That sounds great. However, it's hard to apply your changes if you only quote the text, as we can't use copy'n paste if you do. If you can, provide the changes as HTML. The changes I applied read like this:
<ul>
<li>If you get this message when logged in as the admin of your gallery, then you need to <a href="albums.htm#albmgr_create">create at least one album</a> where files can be uploaded</li>
<li>If you get this message when logged in as a non-admin, then you need to make sure you understand the permissions concept behind Coppermine: on the <a href="groups.htm#group_cp">groups control panel</a> the admin determines whether users can create personal galleries (i.e. create albums inside their user gallery) or if they are allowed to upload into admin-created public albums. If the user <strong>is</strong> allowed to create personal galleries and gets this message, he must create at least one album first by clicking on "Create / Order my albums". If the user is only allowed to upload to public albums (which need to be created by the admin in advance) and gets the above mentioned error message, then the admin needs to specify at least one public album where visitors are allowed to upload, using the <a href="albums.htm#album_prop">album properties</a> screen.</li>
<li>If you get this message when not logged in at all (i.e. being a guest), then you need to review the Coppermine permissions concept as well: if you want to allow guests to upload (not recommended because of potential abuse), you need to specify the general upload ability on the <a href="groups.htm#group_cp">groups control panel</a> (for the guest/anonymous group) and you will also need to modify the <a href="albums.htm#album_prop">album properties</a> screen of at least one album and allow uploads for visitors in that album.</li>
</ul>
It's much easier to use a diff viewer to see your changes.
I'm looking forward to your review of the docs. Please start separate threads on the regular support board for that. A mod will then move your threads as needed.