Dave is right. You have to click the 'Remember Me' box when you log onto the forum.
As for 'spell check', you'll have to download that. When you are posting go to the 'Go Advanced' tab, locate the 'Spell Check' icon, click on it and it will direct you to a free download for a 'spell checker'.
EDIT: I just upgraded to a new computer and Windows 10. Now 'Spell Check' is automatic. It was never there when I was running Windows XP on my old machine. Go figure.