This item is first and foremost designed to travel and therefore collapses to enable this but by doing so it inherently means that it can not have a opening/closing gate in it, which I must say is very obvious from the pictures, even to a one eyed muppet.If you want a system that opens then buy one of the many dozens that is available on the market ,often at less cost.
We use it to stop are one year old escaping into the garden and take it on travels when visiting family, very light and very portable, and it does exactly what it is designed for.