De or het forumsite?

The correct Dutch article is:

de forumsite

Rule Words ending in -te: usually de. See the rule

How to use forumsite

the forumsitede forumsite
this forumsitedeze forumsite
that forumsitedie forumsite
our forumsiteonze forumsite
your forumsitejouw forumsite
every forumsiteelke forumsite
which forumsite?welke forumsite?
a big forumsite / the big forumsiteeen grote forumsite, de grote forumsite