If you can post here, you can post there. Do you mean you're trying to start a private conversation over there with someone? If so, you can't do that until you've had a minimum number of posts (sorry, can't tell you how many). Once you've reached that milestone, you'll have access to extra options here.
Looks like this is your first post. You should be able to post on Resorts, but you will not be able to post any links or photos until you have amassed 10 posts on the DISboards.