Hi, I would like to know how to make those green and red status buttons work when the players are on party mode. Thanks in advance.

When used client sends 0xBF sub 0x1C to server.

Subcommand 0x1c: Spell selected, client side
BYTE[2] unknown, always 2
BYTE[2] selected spell(0-indexed)+scroll offset from sub 0x1b

The SpellIDs used are 0x0b and 0x1d ( Healing and Cure spell IDs )