Advise With Unbounce Landing Page

Hi Guys. I need to make a Landing Page for an event which I will be doing. I am currently researching on the best way to do this. I am thinking of doing a Landing Page on Unbounce. However, I am lost. I have seen an Unbounce template on Themeforest which I like. I want to purchase it, but after I purchase it, how do I customize that template? Would I also need to sign up with and pay in order to be able to customize the Unbounce template which I will purchase from Themeforest? Or is there another way to customize that template without having an Unbounce Account…Any advise would be appreciated.

Yes You Need To Purchase The Unbounce Acc. Too. TO Use/Customize The Unbounce Template.