I've been searching for more information on how to make blog entries into our highenergy-based user and group blogs from external blog-posting clients. So far I have found a way to do this with at least one very nice such external client, MarsEdit, for Mac OS X.
The explanation for how to do this is contained in the accompanying link. Here are the settings I used. You would have to alter this to put in your own username, etc.
Weblog Name: Alan Sill Home page URL: https://highenergy.phys.ttu.edu/users/alansill/ Software: Other Metaweblog-compatible API Endpoint URL: http://highenergy.phys.ttu.edu/RPC2 Blog ID: users/alansill/weblog
I used MarsEdit to make this entry. There may be other such software clients, both free and paid, like this one that can be used from other platforms to make such entries.
Explanatory link: http://www.red-sweater.com/forums/viewtopic.php?id=770
Further information is available here: https://highenergy.phys.ttu.edu/wikihelp/en.lproj/wiki/Using_an_external_blog_editor/Using_a_blog_editing_application.html