Hi, sd7384, and welcome to the forum.
The feature you are looking for is called AutoFill. AutoComplete is for the URL bar only, and IS influenced by the history settings, that's true.
But you want to fill text in forms, right?
K-Meleon doesn't come with that feature out-of-the-box. There is one extension providing a basic form-filling helper
here.
I haven't inspected it closer yet - it seems to work with keyboard shortcuts, which are called "Accelerators" or "Accels" in K-Meleon.
(When configuring that extension, you may need the info found in -> Edit -> Configuration -> Commands List -> Special Keys to Accelerators)
Try if that is enough for your requirements, else come back - maybe someone here wants to update that extension and give it some more features.
btw.: Many people here who are able to help do NOT speak English as their mother tongue. Maybe it wouldn't be a bad idea to write shorter sentences, and to use commas where those can help understanding. Hitting the return key twice does separate paragraphs ...
Providing more info helps helping, too. Like a real link to the page you mentioned, and the K-M and Windows versions you use.
Cheers
SoerenB
Back again ...