I'm afraid you can't. Here is why:
1. Funnelify Agency is an upgrade of Funnelify Ten and/or Funnelify Unlimited which adds the Agency Module in your Funnelify Account.
2. Since Funnelify Agency is only up-sells or upgrade you must have Funnelify Ten or Funnelify Unlimited in your account first in order to buy the Funnelify Agency.
3. Even if you buy Funnelify Agency without buying Funnelify Ten or Funnelify Unlimited you wouldn't be able to use Funnelify because Funnelify Agency is depended on the standard product. So, with only Funnelify Agency in your account you wouldn't be able to login.
Note: In case you bought Funnelify Agency without buying Funnelify Ten or Funnelify Unlimited consider buying the standard/main product from our sales page here: http://funnelify.com/fe/