error C2039: 'FireBullets3' : is not a member of 'CBasePlayer'

help help help, i'm so close to finishin this part of the code for my half-life mod, but when i compile it i get 1 error

error C2039: 'FireBullets3' : is not a member of 'CBasePlayer'

how do i declare this, or add it to my cbaseplayer?

i think this is where it needs to be added but no idea how and what

===
player.h
===

class CBasePlayer : public CBaseMonster
{
public:
int random_seed; // See that is shared between client & server for shared weapons code

int m_iPlayerSound;// the index of the sound list slot reserved for this player
int m_iTargetVolume;// ideal sound volume.
int m_iWeaponVolume;// how loud the player's weapon is right now.
int m_iExtraSoundTypes;// additional classification for this weapon's sound
int m_iWeaponFlash;// brightness of the weapon flash
float m_flStopExtraSoundTime;

float m_flFlashLightTime; // Time until next battery draw/Recharge
int m_iFlashBattery; // Flashlight Battery Draw

float m_flAccuracy;
float m_flLastFire;
short int m_iShotsFired;
short int m_iGlock18ShotsFired;
float m_flGlock18Shoot;

int m_afButtonLast;
int m_afButtonPressed;
int m_afButtonReleased;

edict_t *m_pentSndLast; // last sound entity to modify player room type
float m_flSndRoomtype; // last roomtype set by sound entity
float m_flSndRange; // dist from player to sound entity

float m_flFallVelocity;

int m_rgItems[MAX_ITEMS];
int m_fKnownItem; // True when a new item needs to be added
int m_fNewAmmo; // True when a new item has been added

unsigned int m_afPhysicsFlags; // physics flags - set when 'normal' physics should be revisited or overriden
float m_fNextSuicideTime; // the time after which the player can next use the suicide command

===

any help will be extremely appreciated, i may not of added somethin to my question ie a line fo code that u need to know before u can help, so just ask and i'll post what ever here

thx