Hello misanthrope,
It looks like you registered with Jaman in April of this year but haven't downloaded the Jaman Player, which you will need to watch downloaded movies.
There is definitely a wide library of content to choose from beyond the free movie trailers you've encountered thus far. Without the Jaman Player, you are welcome to watch a selection of free streaming movies that is available in your country through Jaman.
I would suggest reviewing the follow pages:
• Help & Frequently Asked Questions (FAQ):
http://www.jaman.com/faq/
• Sticky titled "UPDATES: Common Questions & Quick Answers":
http://www.jaman.com/forum/Suggestions+and+Issues/discussion/0PSej4Rk898A/
After registering with the site, "Download the Jaman Player" by clicking the link at the bottom of this page.
With the Player, try watching a free trailer, such as for "I am Legend" (http://www.jaman.com/movie/Am-Legend-Trailer/0nKO7pNldJmE/), to test whether you have the technical capabilities to watch movies through Jaman.
If all goes well with viewing the trailer, then you're most likely in good shape to download feature length films through Jaman.
For those of you with questions about Jaman, especially the "How do I do this?" or "Can you help me with . . . " types of queries, it is best to post them under Forums --> "Suggestions & Issues" where Jaman staff goes first to help members.
Forums are a great place to exchange thoughts, ideas, and information about movies, directors, actors, etc. with the Jaman community but if you're searching for answers to technical issues, your best bet is to head to "Suggestions & Issues" because your answer might be sitting there from a previous thread or someone in the Jaman community is apt to read your message and offer a solution.
Thanks for your question and feel free to start a new thread under "Suggestions & Issues" if you have other issues related to how to get started with Jaman.