can load more by clicking a button?

Look at the settings of the plugin, you can already do that.
https://www.your-site-name.com/wp-admin/options-general.php?page=infinite_scroll_options

Configure the plugin and at the end select manual trigger.

Also here you can select how many posts to load at a time(your “xx”)
https://www.your-site-name.com/wp-admin/options-reading.php

thank you very much for your answer, and I’ve done what you told me but I have no button that appears in at the end.. ??
plz help!!

I have the same problem, after switching default to manual trigger there is no trigger in the end, actually cant load the next set of posts..