If you want to ask a new question, do so on the Mailing List. If you get your question answered on the mailing list, please add the question and answer here for other people to find.
Please check if you have all dependencies installed (the ImportError should already give you a clue what's missing). If it's some gpodder-internal module that cannot be loaded, this probably means that you have installed different versions of gPodder on your system that conflict. Make sure to remove all locally-installed gPodder files from /usr/local and also check which gPodder version is installed in /usr and remove the installed gpodder package if necessary. Then, install the newest version from your distribution or via the Download page on gPodder.org. If you still have problems, please file a bug report .
gPodder stores all its settings in gPodder under your home directory (e.g. /home/yourname/gPodder/). To restart with a fresh config, quit gPodder, remove the folder ~/gPodder/ and all its contents and re-start gPodder. All your settings and channel subscriptions will be lost and you can start out with a fresh config. If you changed the location of your download folder before you have to delete the gPodder folder in your self defined location
You can find the answer in the user manual
Simply add your username and password into the URL when adding a channel. gPodder will automatically see the provided authentication data and use it to authenticate to the web server. The syntax is http://USERNAME:PASSWORD@example.org/files/feed.xml.
If your user name consists of an email and the authentication don't work you have to upgrade to gPodder 3.x
This can happen if you aren't running Gnome and there isn't any theme set for GTK applications. You will need to install the Gnome icon theme (normally it's gnome-icon-theme). After that it's easy to setup though, just edit ~/.gtkrc-2.0 and add the following line:
gtk-icon-theme-name = "gnome"