ESXi 5 - 60 days trial - how to apply license?

Hi there,

Does anyone know how to apply license key to ESXi 5?

I downloaded and installed ESXi 5 (free), obtained a license key from VMWare web-site, but have no clue how to assign this license key to a host!

Every time I open Client, I'm getting a license expiration notice:

When I click on link, it redirects me to:

https://www.vmware.com/tryvmware/p/activate.php?p=vmware-vsphere5-ent&lp=default

But, again, nothing regarding how to apply this license key.

Btw, I'm a newb in ESXi.

At our company we mostly use VM Ware WS for development. So, it's my first experience with ESXi.

Please, help.

Thanks in advance,

Bob