Well, ok, let's start at the beginning: can you get phpmyadmin up in a browser?
It will be looking for the user and password from the original installation of mysql (typically 'root' with whatever password you used).
If you get logged in, go to the top of the left pane and use the drop-down list to select the raspberrypints database.
And if you get that far, you'll then see all of the tables inside the database.
At that point you could select the tables of interest and export them to the system you're running the browser on.
fwiw, I found if you backup the database file itself (typically /var/lib/mysql/ibdata1) you can later restore that file and have everything back to that point in time. I have my system archive that file at 12:10AM every evening to a NAS and have had to use it a couple of times...
Cheers!
[ps] fwiw, it's a lot easier to launch phpmyadmin if you create a symbolic link in the Apache2 DocumentRoot (typically either /var/www or /var/www/html, depending) pointing to the executable, thusly:
Code:
$ cd /var/www
$ ln -s /usr/share/phpmyadmin