Wait, do you mean you want to make a marking pack like MM3 or just install them? If installing:
1. Download the pack and save to desktop.
2. Here, open it with Winzip ot Winrar and "export/copy over to" the marking.cfg to the main feralheart folder, or C: > Feralheart. Make sure you replace the already existing .cfg!
3. Export all of the markings to Feralheart > media > terrains. Click replace when it asks.
For making markings: Click me (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=7984.0)
If you need any more help, feel free to ask. I could also fetch the link if needed. :)
I belive this link could help you out! ^.^
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=27569.0 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=27569.0)
Or this one
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=7984.0 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=7984.0)
Good luck! ^.^