How should i substitute handles in tools?

1. Below constraints there should be a drop down thing that says "join".

2. You want to click that and then it should drop down and then click "Always".

3. Then connect the parts.

projectile.MainPart.Touched:connect(function(part)
    if part.Parent:FindFirstChild("Humanoid") then
        print("Target has a humanoid!")
        if not part.Parent = hum.Parent then
            print("Not my character!")
            if checkHit(part.Parent, hit) then
                print(4)
                local EnemyCharacter = part.Parent
                if damage then
                    print(5)
                    eventDamage(nil,char2,damage)
                end
            end
        end
    end

tell me where it reaches and what happens