Hi , i want to create page html with buttons ,and each button can send value of sensor from payload , Can anybody help me?
There are many guides to using Node-RED Dashboard online. I suggest you search for and follow one of those. That will get you up to speed with the basics of using Node-RED dashboard and hopefully help you achieve what you want.
If you're still stuck, then we can of course try to help. But there is more you can do for yourself first.