Newbie having trouble installing bildpunkt theme

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I plan on using the bildpunkt theme i purchased on my bluehost site. I bought it, created a project page, and it shows that I have purchased it. In total I have two accounts....I think that was what i was supposed to do. (one personal account, one community account). So on the community account and the personal account it does not give me the option to "assign" my theme. It says I have nothing to assign. But on the tutorial video it shows that it should have that drop down menu option. this is where I am lost, and have been for hours!! : /

Any help you can give a green chick like me would be greatly appreciated!

- tara