Downloading an item pack for Feralheart is generally easy, Ms.
Once you've downloaded the contents, open the zip. file and within should be a list of items as well as your 'ReadMePlz' note and a file that's titled 'items.cfg'. What you'll need to do is highlight every content within the .zip except the 'ReadMe' and 'items.cfg' file then either drag or copy/paste the highlighted files into Local Disk>Feralheart>Media>Items. Replace/overwrite any duplicates you may encounter. Once those files are in place, go back and drag or copy/paste that file named 'items.cfg' and place it into your main Feralheart directory, which is your main Feralheart folder. Again, overwrite any duplicates you may encounter.
Also, keep in mind once everything's in place, you'll have to completely X-out and re-launch your Feralheart game. Once you launch it back up again and log in, within the Character creation should be a nice list of the items you've downloaded from the packet.
Hope this brief explanation helped ye' out a bit.
Edit: Pretty much what Oreo stated only with a bit additional detail.