Please take the time to spell out words like "and", "you", "your", and "anyone". In conjunction with careful spell-checking
("easily"), you can easily
avoid appearing as dumb as a bowl of mice and might get a more helpful answer than what follows.
Anyway, the very forum software you're using right now, phpBB
, uses HTML templates, though they're not trivial to use. For guestbooks, an easy Google search
yeilded no fewer than 20 very promising leads. A similar search will get you going on forums, too, if phpBB doesn't suit your needs.