Dream signs (or dream signals) are not something you can force. They are something which occurs naturally in your dreams and repeats. Dream journals serve to not only help improve recall but also to make it easier to spot dream signs. If you look to the right on the DJ page of the forum you can see a list of all the tags in your dreams. The larger the word, the more common it is. This is extremely helpful to find out your dream signs and saves you from the hassle of having to look back and read through all your entried.

It also takes practice to realize your dream signs. If you have something which you see in waking life a lot, such as school or a certain animal, preform a RC each time you see these. This way your brain recognizes these and you will recognize them when you are in a dream. Good luck!