There are several reasons why it can not be visible. First of all, watch out the place you create a page, it shall be Project Management section. Most important, do not forget to use the right template, if it is monthly report, then use monthly report template. If quarterly, then use quarterly report template. Why? This will make your life easier, and you can see your report on the right page with the right labels and on top of it it will be included on the slide show in the front. Nice, isn't it? However, in case you already made with normal blank page, then you need to make 2 steps: go to Tools > Convert page to Blog > and when you are on your page, down on the right you will find labels, write monthly, it will already offer, press Add. Work is done!