Remember, you must READ and FOLLOW the RULES as well as the ones on this page or you will be banned!
There is only one type of post allowed here, and four types of replies. Posts are specifications only, as described in the rules.
Replies must be either A) clarification requests (when there is ambiguity in the specification) or B) include links to demo applications or videos (read and follow the rules, see link above), C) acknowledgement of questions where the poster then updates the specification or D) replies recording an agreement to enter into a contract or publicly documenting aspects of the transaction such as code reception and payment for iterations (see Guidelines).
Once you have made a post, you may not attempt to make the programmer develop the application inside of the topic by requesting changes in the thread without first paying for the time spent developing the demo. If you see a good demo, you may contact the programmer as you like and hire/contract them. Once they have received payment for their time working on the demo then they can continue work (not before).
READ THE RULES in the link above and follow them or you will be banned.