I need to update the softwear but if it says no softwear avelibe

If you mean that you need to update the OS beyond El Capitan, it is possible that your MacBook does not support further updates. If you provide more information about your specific model and the reason for your need, it will make it easier for those here to help you. Clicking on the Apple logo in the topmost left corner of your screen and selecting "About This Mac" gets the information about which MacBook you have.