Well, there is a README file inside the ZIP-file with instructions. Are those unclear?
https://github.com/zeidlos/Auto-Squa.../master/README
Squad XML Generator by Tier1 Operations (http://tier1ops.eu) v0.2
This work is licenced under the Creative Commons by-nc-sa 3.0 Licence
https://creativecommons.org/licenses...sa/3.0/deed.en
*Install instructions*
phpBB Setup:
1. Go to your phpBB admin panel, go to users & groups, click on 'Custom profile fields'
2. Create a new field, called 'arma_player_id' (single text field).
3. Create a new field, called 'xml_remark' (textarea)
4. Create a group for every rank, or note the group_id from your allready existing group.
5. Go to xml.php and change the values in 'ranktogroupid' according to your stuff.
Code:
<?php
function ranktogroupid($rank) {
$out=9; # Default to Recruits
switch (ucfirst($rank)) {
case 'PRCT':
$out = 8;
break;
case 'Recruit':
$out = 9;
break;
case 'Grunt';
$out = 10;
break;
case 'Regular';
$out = 11;
break;
case 'Specialist';
$out = 12;
break;
case 'Corporal';
$out = 13;
break;
}
Note here: The numbers are your group ID's. The case 'Regular' is the rank. This 'Regular' String needs to be the same as the filenames. If you change 'Regular' to 'Sgt' you'll need to rename the files accordingly.
XML Generator Setup
1. Copy this code onto a webserver running php-cli (naturally the server that runs your phpBB installation).
2. Change the values of config.inc to your needs.
The config.inc should be pretty self-explaining. You'll obviously need to provide login to your MySQL database and specify the table the installation is running at.
3. If you want, rename the ranks provided and change the pictures.
Note: You'd also need to change the names in the xml.php
4. Run generateXML directly on the shell or trough a cronjob.
5. Have Fun. 
Anything still unclear?