need help with CreateConVar n players

I am making a billboard advertising addon and everything was good until my friend joined when i changed the convar string it will only change for me .
can someone help me figure out how to send it to all players.

hers my client side file

[lua]
include(‘shared.lua’)
AddCSLuaFile(“shared.lua”)

tittle_line = CreateConVar( “bill_board_zero1”, “Title”, true )
first_line = CreateConVar( “bill_board_zero2”, “AdGoesHere”, true )

function ENT:Draw()

self:DrawModel()
local Pos = self:GetPos()
local Ang = self:GetAngles(Angle(0,0,0))
local tittle_line = tittle_line:GetString()
local first_line = first_line:GetString()
Ang:RotateAroundAxis(Ang:Right(), -90)
Ang:RotateAroundAxis(Ang:Up(), 90)

cam.Start3D2D(Pos + Ang:Up() , Ang, 0.51)
	
	surface.SetDrawColor(0,0,0,255)
	surface.DrawRect (-217,-111,434,224)

	surface.SetDrawColor(255,0,0,255)
local width = 433
		height = 35
	surface.DrawRect (-217,-111,width ,height)
	draw.DrawText( tittle_line, "DermaLarge", 0, -110, Color(255,255,255,255), TEXT_ALIGN_CENTER  )
	draw.DrawText( first_line, "DermaLarge", 0, -30, Color(255,255,255,255), TEXT_ALIGN_CENTER  )
	
	
	surface.SetDrawColor(255,0,0,255)
	surface.DrawOutlinedRect (-217,-111,434,224) 

cam.End3D2D()

end

[/lua]

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