You can see your Current Plans under Account Management.  If you want to change your Plan from Free you have to Add Subscription (Click here to Add Subscription) first

Transfer Company 1  

Once you are subscribed to a paid plan, Choose the company you need to change from the FREE subscription and click View Companies.

Transfer Company 2

Select the Company  you want to transfer and Click Change Plan.

Transfer Company 3

Click drop down arrow and choose the plan you want.

Transfer Company 4  

Click Change.

Transfer Company 5  

Now you will see the plan you subscribed.

Transfer Company 6