Take the legs as wide as you can and keep the feet flexed to engage the legs and keep a firm base.
Take a breath in and straighten the spine lift the lower ribs and roll the shoulders back to open the chest.
As you breath out fold from the hips and fold forward but also try to move forward and lead with the chest and not the head.
Depending on your flexibility how far you will move (sometimes there is little movement).
Try to take the hands forward but keep the shoulders relaxed and us the stickyness of your mat to pull you forward. Rest the elbows on the floor or if you can the chest.
A good tip to open out the hips try to roll your legs backwards and this may give you a little more space to go forward.