DD, I would think there should be no restrictions on your ability to search the forums, as a registered member. I can say that it does appear the search feature puts quite a load on the board and can take a bit of time to return the results.
I would just recommend being clear with your search keywords to get the best results.
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I also just noticed and might be worth noting to newbies. It appears that the average response (per topic view) is around 10%.
So just a reminder that the more you post, the more your thread gets views, and the more likely you are to get responses and feedback.
Keep posting and stay patient, even when you feel panicked!