First of all...Download it. Then unzip it, upload getPath.pl where you want to install PPLOG, and open PPLOG.pl with notepad or any text editor.
Now, there are 2 things that you MUST edit, one is the path to the comments folder, and the other is the path the the posts (also called entries) folder. Just run the script getPath and you will know it. (Run the script going to http://mysite.com/blog/getPath.pl)

Finally Change this:
our $configpostsDatabaseFolder = '/home/www/mysite.coom/posts';
our $configcommentsDatabaseFolder = '/home/www/mysite.com/comments';

To this:
our $configpostsDatabaseFolder = 'mypath/posts';
our $configcommentsDatabaseFolder = 'mypath/comments';

Once you have done that, delete getPath.pl and upload pplog.pl in ASCII MODE! and CHMOD it to 755.
Then upload the rest of the files in BINARY MODE!

Run pplog.pl (you can rename it) and you have your own blog :] Fast huh?
Now, you can edit the configuration of pplog.pl you have many options to choose, you choose what you want, edit the title of the blog, etc.

Finally if you want to change the style, there is a folder called "Styling tools", there there is a css and a html file, edit the css and you will see the changes in the html file as if it was your blog. Just edit what you want or make a whole new skin, once you have finished, just replace all files. You can also use a premade skin, and to change skins is the same... Just replace all ;)

Good luck. Remember to change the admin password at the configuration!