Breath and voice

Hello, Everyone I have been getting  trouble with connecting my breath  with my voice, I mean I can breath In a low  and relaxed way but when I sing I dont feel like my breath is supporting my voice even though I breath from diaphragm, how can I use my breath to support my voice and get connect with it 

The easiest way to feel that connection (in my experience) is with a lip trill! You can also practice a "Santa Clause" laugh ("ho ho ho"), in which your belly gently pulses. Then sustain those pitches, and you're basically singing!

Thanks Camile,but i also wanted to know when i sing should i keep the ribs expanded and let the belly fall first or do i need the ribs to let it fall with belly?

Ideally, you're keeping your chest and ribcage lifted as you sing, while your belly could stay expanded (that's more "classical" style) or gradually contract back inwards. 

Do you mean we have to contract belly gradually inwards and keep our chest and ribs expanded as we are singing(in pop style)?

You don't technically want to contract your belly inwards - it may just naturally happen as you use your air! I wouldn't worry too much about your belly, as long as your chest and ribs stay lifted. 

okay CAMILLE.Thank you..

You're welcome, Pemba!