HELP with kyros mid7022 clear autocomplete

[castle55]

I have never used an android o/s before and I need some advise on how to perform most tasks. I let my grand kids play with it and I now have gibberrise locked into the user and password autocomplete on my bookmarked sites. How can I clear these out?? I diabled autocomplete rebooted. no luck. I'm used to windows paint and delete.