1. Login into Manager Zone.
2. Go to the page "Office » Transfers » Transfers", or the equivalent page for languages other than english.
3. Select the player(s) you wish and copy them (CTRL + C).
4. Go to mzmanager.com click on the menu "LOAD PLAYERS - TRANSFER MARKET" 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.