i want to redirect the client traffic to a webpage
simply i want to use the web page when i want to block the client from accessing internet but
when he will load a web page (any web) to be redirected to a web page that says you have contact administrator for further use of the internet
You setup a redirect NAT on the mikrotik (search the forums for examples) for the customer using TCP, port 80 and redirect that to a web server (not running on the mikrotik). On your web server, you will need to customize the error 404 web page it returns with the info you want. This is because the client will be sending a request for http://www.google.com (for example) and you will have sent that to your web server which will not know anything about that URL, so it returns the error 404 html page.
look in the posts here because a post about redirect is already in this forum
ThankYOu