[howard1952]

I want to be able to substitute the words offered.

I don't want the malevolent numpty in my phone to automatically change what I have keyed.

OK, standard keyboard, how do I access its settings?

[Rukbat]

That depends on the keyboard you're using, but "Automatically substitute" or "Automatically replace" should be in its settings somewhere, and it should be settable to on or off.

[howard1952]

I am using the standard Samsung keyboard.

Under settings, there are NO keyboard options to set.