thanks all, I just bought a vps to try una as I couldn't see the functionality of video chat, it is pitty that such a wonderful software doesn't have on itself a powerful chat and video chat module activated or lack of some websites, they are looking for members, why not new una client become client trhough these sites, I sent a message for Andrew and I hope he will get back to me soom.
Indeed, the problem was understanding difference between monthly? and Power apps, and also cloud hosting, which is not clear if the client will have access to files, so will be possible for him to do some changes