Have you tried this?

http://codologic.com/page/node/768

i tried friechat telling me to install plugin bt the plugin not supported by it... its for joomala  there should a custom code for oxwall i cant find the code :( help needed

Topic was moved from General Questions.

Try Uploading the zipped file to your site public_html via cpanel (or where your site files are installed)

Unzip/extract the folder/files

Run the following url http://your_website.com/freichat/installation/index.php

Click "accept"

Select your CMS (oxwall)

click "proceed"

The following is copied from the above linked page and in my opinion self explanatory.
Just make sure you follow instructions

Step 4 - Permissions

Normally , you should not have a problem here .

If any of the above files are not writable , give them write permissions and then refresh the page

Step 5 - choosing a password

Please change the default password for security reasons . For those who chose Customized driver for integration , this password is the same password as in the third step

Step 6 - Last step

If there is an option visible to download a module , then it is recommended to download and install it . Else If it is not visible then you will have to go with the manual installation