No data recorded

We are just trying tp move from Phpmyvisit to Piwik.
We have installed Piwik 1.12 with no error. We have accessed to the administration.
We write the tag just in one page (
We tried to open several times the page.
We do not see any data recorded.
Is it normal?
What should we do?
Thanks for your help

Sure see FAQ Troubleshooting - Analytics Platform - Matomo