why when use Search bottom on this site say "You are searching too quickly" and how to other find members ??
Just wait some time before searching again. Sometimes this website is too slow or congested and searches don't work well. In such cases it's better to find topics on google than here on bitcointalk. Just search for example "xxxcoin ann bitcointalk" on google and you'll get the results.
Finding members is very easy instead. Click on "members" in your dashboard and then "search for members" . That's all!