Could use a little more explanation. What do you mean "set up link to the page" -- where is this link, and how did you set it up?
And when you see "no input file specified", is it an error message in the middle of your website (so you see your header/footer/background, etc.), or is it just a totally white page with black text in it?

i hve created main page and add another page
added few contents in new page
then from main page click on link for another page gives this error
whole page is blank only shows "No input file specified"

Sounds like a problem with either pretty URL's or with php's PATH_INFO setting. First I would try turning OFF pretty url's in the dashboard (Dashboard -> Sitewide Settings, uncheck the "Pretty URL's" box and click the Save button). If that doesn't help or they were already off, it's probably a much trickier problem which has to do with the fact that the url's have /index.php/ in the middle of them. Is this website running under a temporary url assigned by your web host that has a "tilde" character in it (for example,http://example.com/~myname/website)?... That sometimes causes problems too. Unfortunately for these kinds of problems I don't know of any single solution to tell you -- you will need to contact tech support with your web hosting company and ask them if they can help.

I turned the Pretty URL's off and now it works
Now, what should I do to have it to work even with pretty URL's ON? I already copied the code into the .htaccess file of my concrete5 directory. Is it that I have to paste that code not in the .htaccess of the concrete5 directory but in the main host directory??

Thanks in advance

I am a very experienced web developer and honestly every time I install a site on a client's web hosting I run into one problem or another.
The problem is that every server is set up slightly differently, so unfortunately there is not one answer that works in every situation.
What is the web hosting company you are using? Have you tried searching the forums and read some of the other threads about this issue -- there's a lot of them, but every one is resolved in a slightly different way -- it usually takes just a bunch of trial and error to figure out which solution works for your web host.

Some of the solutions that have worked for me in the past are:
http://www.concrete5.org/developers/bugs/5-4-1-1/path_info-problem/...
http://jeremeclaussen.com/blog/2010/3/30/concrete5-pretty-urls-and-...
http://www.concrete5.org/index.php?cID=5346...
http://www.concrete5.org/community/forums/installation/solved-andqu...

This solution worked for me hosting at fatcow.com

http://jeremeclaussen.com/blog/2010/3/30/concrete5-pretty-urls-and-...

Thanks Jereme!

Same problem with two servers one in domain eu one with pl, but when i turn it off - it works too, when preety is on then no subsites or any main sites working except main site. Thanks but it seems to not quite solve the problems with pretty urls. Sorry for my language;)

i hve created main page and add another page
added few contents in new page
then from main page click on link for another page gives this error
whole page is blank only shows "No input file specified"

i hve created main page and add another page
added few contents in new page
then from main page click on link for another page gives this error
whole page is blank only shows "No input file specified"