You're welcome to upgrade a Kudoboard at anytime, simply follow these steps:
1. When viewing the board, click Settings (the gear icon near the top of the page), which will open a slider on the righthand side of the page.
2. Near the top of the slider, click the Upgrade Board button. You'll be directed you to a new page where you can select your desired upgrade option and pay. Once purchased, you will have immediate access to board features. Any changes made to the board previously will be saved.
Please note that this upgrade will apply only to this individual board. If you want purchase an ongoing plan, check out either Premium Packages (bundle of boards for individual creators) or Business/Enterprise plans (unlimited boards, multiple creators, and all the extra bells & whistles).