The auto predict feature on your galaxy s6 edge can be helpful, or can be annoying depending on who you are. This is a stock feature that comes on every galaxy s6 edge. To turn off the auto predict feature simply go into the settings on your galaxy s6 edge and scroll down to language and input. Next click the third option in this section that says samsung keyboard.
From in here you will see an option that says predictive text. All you need to do now is set this to off. You can test that its off by pulling up any text message conversation and seeing if while you type there is a suggestion in the top or not.