The method of changing your settings to disable Infinite Scroll has changed (April, 2018). Until the following posts are updated by their owners, these basic illustrations show the newer procedure.
1) Go to -> My FlyerTalk and select -> Settings and Options, and from there ->Edit Options on to ->Thread Display Options (scroll down to find that) and ->Infinite Scroll.
There, click on or touch
Infinite Scroll
Automatically load the next page in a thread by continuing to scroll down when viewing the desktop style
0 Enable Infinite Scroll 0 Disable Infinite Scroll