1. Login into Manager Zone.
2. Go to the page "Club house » Players » Alt. View", or the equivalent page for languages other than english.
3. Select all the players and copy them (CTRL + C).
4. Go to the initial page of mzmanager.com and paste the data into the form (CTRL + V). Note: make sure you are in the correct form.
5. Click "Load Data" and you're all done.