If you disable the banner you will be violating the TOS of free hosting provider. I suggest you purchase hosting. Hosting prices have dropped to very low levels. Remember your posts reflect on your character, you do not want to come across as someone who is less than honorable.
I've found ways in the past to disable these banners, however, it was time consuming and resulted in getting insta-banned within a week, I eventually grew up and purchased hosting. I really recommend you just bite the bullet and buy some hosting, i mean, its super cheap nowadays anyway.